Hawaii Maui Waianapanapa Park (22028557463)

Black sand is

sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of s ...

that is black in color. One type of black sand is a heavy, glossy, partly

magnetic Magnetism is the class of physical attributes that are mediated by a magnetic field, which refers to the capacity to induce attractive and repulsive phenomena in other entities. Electric currents and the magnetic moments of elementary particle ...

mixture of usually fine sands containing minerals such as

magnetite Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe2+Fe3+2O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. With the ...

, found as part of a

placer deposit In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word ''placer'', meaning "alluvial sand". Placer min ...

. Another type of black sand, found on beaches near a

volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...

, consists of tiny fragments of

basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...

. While some beaches are predominantly made of black sand, even other color beaches (e.g. gold and white) can often have deposits of black sand, particularly after storms. Larger waves can sort out sand grains leaving deposits of heavy minerals visible on the surface of erosion

escarpment An escarpment is a steep slope or long cliff that forms as a result of faulting or erosion and separates two relatively level areas having different elevations. The terms ''scarp'' and ''scarp face'' are often used interchangeably with ''escar ...

Placer deposits

Black sands are used by miners and prospectors to indicate the presence of a placer formation.

Placer mining Placer mining () is the mining of stream bed (Alluvium, alluvial) deposits for minerals. This may be done by open-pit mining, open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment. Placer minin ...

activities produce a concentrate that is composed mostly of black sand. Black sand concentrates often contain additional valuables, other than precious metals:

rare earth element The rare-earth elements (REE), also called the rare-earth metals or (in context) rare-earth oxides or sometimes the lanthanides (yttrium and scandium are usually included as rare earths), are a set of 17 nearly-indistinguishable lustrous silv ...

thorium Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately soft and malleable and has a high me ...

titanium Titanium is a chemical element with the symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in ...

tungsten Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. Tungsten is a rare metal found naturally on Earth almost exclusively as compounds with other elements. It was identified as a new element in 1781 and first isolat ...

zirconium Zirconium is a chemical element with the symbol Zr and atomic number 40. The name ''zirconium'' is taken from the name of the mineral zircon, the most important source of zirconium. The word is related to Persian '' zargun'' (zircon; ''zar-gun'', ...

and others are often fractionated during

igneous Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or ...

processes into a common mineral-suite that becomes black sands after weathering and erosion. Several

gemstone A gemstone (also called a fine gem, jewel, precious stone, or semiprecious stone) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks (such as lapis lazuli, opal, ...

s, such as

garnet Garnets () are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. All species of garnets possess similar physical properties and crystal forms, but differ in chemical composition. The different s ...

topaz Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al Si O( F, OH). It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can mak ...

ruby A ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum ( aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sa ...

sapphire Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide () with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. The name sapphire is derived via the Latin "sapphir ...

, and

diamond Diamond is a Allotropes of carbon, solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the Chemical stability, chemically stable form of car ...

are found in placers and in the course of placer mining, and sands of these gems are found in black sands and concentrates. Purple or ruby-colored garnet sand often forms a showy surface dressing on ocean beach placers. An example of a non-volcanic black sand beach is at Langkawi in Malaysia.

Basalt fragments

When

lava Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or un ...

contacts water, it cools rapidly and shatters into sand and fragmented debris of various size. Much of the debris is small enough to be considered sand. A large lava flow entering an ocean may produce enough basalt fragments to build a new black sand beach almost overnight. The famous "black sand" beaches of Hawaii, such as Punaluʻu Beach and

Kehena Beach Kehena Beach is a narrow black sand beach located on the east shore of the island of Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the o ...

, were created virtually instantaneously by the violent interaction between hot lava and sea water. Since a black sand beach is made by a lava flow in a one time event, they tend to be rather short lived since sands do not get replenished if currents or storms wash sand into deeper water. For this reason, the state of Hawaii has made it illegal to remove black sand from its beaches. Further, a black sand beach is vulnerable to being inundated by future lava flows, as was the case for Hawaiʻi's Kaimū, usually known simply as Black Sand Beach, and Kalapana beaches. An even shorter-lived black sand beach was Kamoamoa. Unlike with white and green sand beaches, walking barefoot on black sand can result in burns, as the black sand absorbs more

solar radiation Solar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre (W/m ...

Beaches

Black sand has formed beaches in places including:

Europe

* Bulgaria **

Burgas Burgas ( bg, Бургас, ), sometimes transliterated as ''Bourgas'', is the second largest city on the Bulgarian Black Sea Coast in the region of Northern Thrace and the fourth-largest in Bulgaria after Sofia, Plovdiv, and Varna, with a popu ...

* Faroe Islands ** Fuglafjørđur **

Tjørnuvík Tjørnuvík ( da, Tjørnevig) is the northernmost village on Streymoy in Sunda Municipality, Faroe Islands. As of the 2006 census, the population has a total of 71 people. The town uses the Stakkur sea stack for sheep grazing, accessed by cabl ...

* Italy **

Ladispoli Ladispoli is a town and ''comune'' in the Metropolitan City of Rome, Lazio, central Italy. It lies about west of Rome, on the Mediterranean Sea. History Modern Ladispoli includes the site of the ancient ''Alsium'' at nearby Palo Laziale, the po ...

Naples Naples (; it, Napoli ; nap, Napule ), from grc, Νεάπολις, Neápolis, lit=new city. is the regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 909,048 within the city's adminis ...

* Georgia **

Ureki Ureki ( ka, ურეკი) is a town and a seaside climatic resort on the Black Sea coast of Georgia. Located within Ozurgeti District in the region of Guria, Ureki is 60 kilometers north of Batumi and approximately 300 km west of the natio ...

* Greece ** Perivolos beach,

Santorini Santorini ( el, Σαντορίνη, ), officially Thira (Greek: Θήρα ) and classical Greek Thera (English pronunciation ), is an island in the southern Aegean Sea, about 200 km (120 mi) southeast from the Greek mainland. It is the ...

* Cyprus ** Governor's Beach,

Limassol Limassol (; el, Λεμεσός, Lemesós ; tr, Limasol or ) is a city on the southern coast of Cyprus and capital of the district with the same name. Limassol is the second largest urban area in Cyprus after Nicosia, with an urban population ...

* Iceland **

Vík í Mýrdal The village of Vík (; or Vík í Mýrdal in full) is the southernmost village in Iceland, located on the main ring road around the island, around by road southeast of Reykjavík. Despite its small size (750 inhabitants in Mýrdalshreppur as ...

Reykjanes Reykjanes () is a small headland on the southwestern tip of the Reykjanes Peninsula in Iceland, giving the main peninsula its name. The region is about from Iceland's international airport. As the name means "smoking peninsula" connected to volc ...

** Stokksnes * Portugal **

Azores ) , motto =( en, "Rather die free than subjected in peace") , anthem= ( en, "Anthem of the Azores") , image_map=Locator_map_of_Azores_in_EU.svg , map_alt=Location of the Azores within the European Union , map_caption=Location of the Azores wi ...

*** São Roque, São Miguel *** Mosteiros, São Miguel **

Madeira ) , anthem = ( en, "Anthem of the Autonomous Region of Madeira") , song_type = Regional anthem , image_map=EU-Portugal_with_Madeira_circled.svg , map_alt=Location of Madeira , map_caption=Location of Madeira , subdivision_type=Sovereign st ...

* Spain **

Tenerife Tenerife (; ; formerly spelled ''Teneriffe'') is the largest and most populous island of the Canary Islands. It is home to 43% of the total population of the archipelago. With a land area of and a population of 978,100 inhabitants as of Janu ...

*** Playa El Bollullo, near

Puerto de la Cruz Puerto de la Cruz is a city and municipality in the northern part of the island of Tenerife, Canary Islands, Spain. It was formerly known by its English translation, "Port of the Cross", although now it is known by its Spanish name in all lang ...

*** Playa Jardín, Puerto de la Cruz *** Playa Las Gaviotas near Santa Cruz **

La Palma La Palma (, ), also known as ''La isla bonita'' () and officially San Miguel de La Palma, is the most north-westerly island of the Canary Islands, Spain. La Palma has an area of making it the fifth largest of the eight main Canary Islands. The ...

*** Playa de Los Cancajos, Breña Baja **

Fuerteventura Fuerteventura () is one of the Canary Islands, in the Atlantic Ocean, part of the North Africa region, and politically part of Spain. It is located away from the northwestern coast of Africa. The island was declared a biosphere reserve by UNES ...

*** Playa de Ajuy *** Playa Pozo Negro ** Galicia ***Praia de Teixidelo,

Cedeira Cedeira is a municipality in the province of A Coruña in the autonomous community of Galicia in northwestern Spain. It is situated in the northern coast of the Rías Altas. Cedeira has a population of 7,412 inhabitants ( INE, 2010). Parroquias * ...

(non-volcanic)

Africa

*Egypt *Algeria *Cameroon ** Limbe ** Idenau **

Debundscha Debundscha is a village in the south-western Region of the republic of Cameroon. It is found at the foot of the Mount Cameroon at its south western corner directly facing the south Atlantic ocean on the Cameroon coast. Debundscha has an extremel ...

North America

* Canada ** Black Beach, Lorneville, New Brunswick (near Coleson Cove Generating station, west of Saint John) ** Salmon Cove Beach, Conception Bay, Newfoundland * Mexico ** Playa Patzcuarito (Nayarit) ** Playa La Ventanilla (Oaxaca) * United States ** Black Sand Beach,

Prince William Sound Prince William Sound (Sugpiaq: ''Suungaaciq'') is a sound of the Gulf of Alaska on the south coast of the U.S. state of Alaska. It is located on the east side of the Kenai Peninsula. Its largest port is Valdez, at the southern terminus of the Tr ...

, Alaska, ** Lowell Point Beach, Seward, Alaska ** Black Sand Beach,

Lost Coast The Lost Coast is a mostly natural and undeveloped area of the California North Coast in Humboldt and Mendocino Counties, which includes the King Range. It was named the "Lost Coast" after the area experienced depopulation in the 1930s. In add ...

, California

Central America

* Costa Rica ** Playa Negra, Guanacaste ** Playa Negra, Puerto Viejo,

Limón Limón (), commonly known as Puerto Limón, is a district, the capital city and main hub of Limón province, as well as of the Limón canton in Costa Rica. It is the seventh largest city in Costa Rica, with a population of over 55,000, and is ho ...

* Guatemala ** Puerto de San José, Monterrico, Champerico, Puerto Quetzal * Panama ** Las Lajas, Chiriquí Province * El Salvador ** Playa El Tunco

Caribbean

Saint Vincent and the Grenadines Saint Vincent and the Grenadines () is an island country in the Caribbean. It is located in the southeast Windward Islands of the Lesser Antilles, which lie in the West Indies at the southern end of the eastern border of the Caribbean Sea wh ...

* Montserrat (most beaches except Rendezvous Beach) * St. Eustatius * St. Kitts * Nevis * Jamaica * Dominica (most beaches) * Martinique (most North east Beaches and Anse Noire beach) * St. Lucia **

Anse Chastanet Anse may refer to: Places * Anse, Belgium, a municipality in Belgium * Anse, Rhône, a commune in France * Anse-Bertrand, a commune in Guadeloupe * Anse-Bleue, New Brunswick, a community in Canada * Anse, Mississippi, an unincorporated commun ...

* Guadeloupe :* Grand Anse beach, Basse-Terre * Grenada * Venezuela * St.Thomas (USVI) * Puerto Rico (US) :* Barceloneta, Machuca's Garden :* Playa Negra in Vieques * Dominican Republic :* Cocolandia, Palenque Beach, San Cristóbal :* Baní Sand Dunes, Peravia, Baní Black Stone Beach, Santa Cruz, Aruba

Asia

* Varkala Black Beach,

Varkala Varkala, is a major coastal municipality situated in the northern suburb of Trivandrum, capital city of the Indian state of Kerala. It is the headquarters of Varkala Taluk and important government institutions such as the taluk office, court ...

Kerala Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

Alappad Alappad is a coastal village in the Kollam district of the Indian state Kerala. It is situated on a narrow strip of land sandwiched between the Arabian Sea and the TS Canal – the village is approximately 16 km long and its narrowest point ...

Kollam Kollam (), also known by its former name Quilon , is an ancient seaport and city on the Malabar Coast of India bordering the Laccadive Sea, which is a part of the Arabian Sea. It is north of the state capital Thiruvananthapuram. The city i ...

Valsad Valsad (Pronunciation: �alsɑɖ (Gujarati: વલસાડ), historically known as Bulsar, is a city and a municipality in Valsad district of the Indian state of Gujarat. It is the district headquarters of Valsad district. The city of Valsad ...

Hac Sa Beach Hac Sa Beach () is a beach in Coloane, Macau. It is the largest natural beach in Macau. Name The name "Hac Sa", is a translation from Cantonese (), literally means the famous black sand. However, to prevent the beach from disappearing due to ero ...

Macao Macau or Macao (; ; ; ), officially the Macao Special Administrative Region of the People's Republic of China (MSAR), is a city and special administrative region of China in the western Pearl River Delta by the South China Sea. With a pop ...

Hunza River Hunza River ( ur, ) is the principal river of Hunza in Gilgit–Baltistan, Pakistan It is formed by the confluence of the Chapursan and Khunjerab ''nalas'' (gorges) which are fed by glaciers. It is joined by the Gilgit River and the Naltar R ...

Pakistan Pakistan ( ur, ), officially the Islamic Republic of Pakistan ( ur, , label=none), is a country in South Asia. It is the world's List of countries and dependencies by population, fifth-most populous country, with a population of almost 24 ...

Jambi Jambi is a province of Indonesia. It is located on the east coast of central Sumatra and spans to the Barisan Mountains in the west. Its capital and largest city is Jambi. The province has a land area of 50,160.05 km2, and a sea area of 3, ...

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

Langkawi Langkawi, officially known by its sobriquet Langkawi, the Jewel of Kedah ( ms, Langkawi Permata Kedah ), is a duty-free island and an archipelago of 99 islands (plus five small islands visible only at low tide in the Strait of Malacca) locate ...

Malaysia Malaysia ( ; ) is a country in Southeast Asia. The federation, federal constitutional monarchy consists of States and federal territories of Malaysia, thirteen states and three federal territories, separated by the South China Sea into two r ...

Lung Kwu Tan Lung Kwu Tan () is an area located in the western part of the Tuen Mun District in Hong Kong. Geography The area is located to the southwest of Castle Peak and consists of Lung Kwu Tan and Lung Kwu Sheung Tan. Lung Kwu Tan is a beach with b ...

Hong Kong Hong Kong ( (US) or (UK); , ), officially the Hong Kong Special Administrative Region of the People's Republic of China ( abbr. Hong Kong SAR or HKSAR), is a city and special administrative region of China on the eastern Pearl River Delt ...

Kaohsiung Kaohsiung City (Mandarin Chinese: ; Wade–Giles: ''Kao¹-hsiung²;'' Pinyin: ''Gāoxióng'') is a special municipality located in southern Taiwan. It ranges from the coastal urban center to the rural Yushan Range with an area of . Kaohsi ...

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...

Yilan Yilan may refer to: China * Yilan County, Heilongjiang (依兰县), county of central Heilongjiang province, People's Republic of China * Yilan Town, Heilongjiang (依兰镇), seat of Yilan County * Yilan, Jilin (依兰镇), town in Yanji Taiwan ...

, Taiwan *

Akyab Sittwe (; ; formerly Akyab) is the capital of Rakhine State, Myanmar (Burma). Sittwe, pronounced ''sait-tway'' in the Rakhine language, is located on an estuarial island created at the confluence of the Kaladan, Mayu, and Lay Mro rivers emptyi ...

Arakan Arakan ( or ) is a historic coastal region in Southeast Asia. Its borders faced the Bay of Bengal to its west, the Indian subcontinent to its north and Burma proper to its east. The Arakan Mountains isolated the region and made it accessi ...

Kaladan River The Kaladan River ( my, ကုလားတန်မြစ်, ; also Kysapnadi, Beino, Bawinu and Kolodyne) is a river in eastern Mizoram State of India, and in Chin State and Rakhine State of western Myanmar. The Kaladan River is called the Chh ...

, Chin State and Rakhine State,

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...

Lingayen Gulf The Lingayen Gulf is a large gulf on northwestern Luzon in the Philippines, stretching . It is framed by the provinces of Pangasinan and La Union and sits between the Zambales Mountains and the Cordillera Central. The Agno River and the Balili ...

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

North Atlantic

* Reynisfjara, Iceland

North Pacific

Iwo Jima Iwo Jima (, also ), known in Japan as , is one of the Japanese Volcano Islands and lies south of the Bonin Islands. Together with other islands, they form the Ogasawara Archipelago. The highest point of Iwo Jima is Mount Suribachi at high. ...

* Kugenuma Kaigan,

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

* Hawaiʻi nei ** "Big Island" *** Isaac Hale Beach Park (Pohoʻiki) *** Kaimū (destroyed by lava flow in 1990, now a new black sand beach is forming) ***

*** Punaluʻu Beach ***

Richardson Beach Richardson Beach (also known as Richardson Ocean Park) is a Hawaii County park located just east of Hilo, Hawaii, on the Big Island of Hawaii. Adjacent is the Lele'iwi Beach Park. History The name ''Richardson'' comes from its original owners ...

Hilo Hilo () is a census-designated place (CDP) and the largest settlement in Hawaii County, Hawaii, Hawaii County, Hawaii, United States, which encompasses the Hawaii (island), Island of Hawaii. The population was 44,186 according to the 2020 United ...

*** Waipiʻo Beach **

Maui The island of Maui (; Hawaiian: ) is the second-largest of the islands of the state of Hawaii at 727.2 square miles (1,883 km2) and is the 17th largest island in the United States. Maui is the largest of Maui County's four islands, which ...

*** Honokalani Black Sand Beach and Waiʻanapanapa Black Sand Beach in Waiʻanapanapa State Park *** Oneʻuli Beach also known as Naupaka Beach

South Pacific

* Guam ** Talafofo * New Zealand (listed from North to South) **

Muriwai Muriwai, also called Muriwai Beach, is a coastal community on the west coast of the Auckland Region in the North Island of New Zealand. The black-sand surf beach and surrounding area is a popular recreational area for Aucklanders. The Muriwai ...

Bethells Beach Te Henga, or Bethells Beach, is a coastal community in West Auckland, New Zealand. The Māori name for the area, "Te Henga", is in reference to the long foredunes which run along the beach and look like the or gunwale of an upturned waka hull. ...

Anawhata Anawhata is a beach on the coast of New Zealand west of Auckland. Geography Anawhata Beach is located along the West Coast of West Auckland, between the Tasman Sea and the Waitākere Ranges. It is located south of Te Henga / Bethells Beach, ...

Piha Piha is a coastal settlement in West Auckland, on the western coast of the Auckland Region in New Zealand. It is one of the most popular beaches in the area and a major day-trip destination for Aucklanders throughout the year, and especially ...

** Karekare **

Whatipu Whatipu is a remote beach on the west coast of the Auckland Region in the North Island of New Zealand. The Whatipu area has been managed as a scientific reserve by the Auckland Regional Council since 2002. The road to it is unsealed. To the so ...

** Karioitahi Beach ** Raglan **

Taranaki Taranaki is a region in the west of New Zealand's North Island. It is named after its main geographical feature, the stratovolcano of Mount Taranaki, also known as Mount Egmont. The main centre is the city of New Plymouth. The New Plymouth Dist ...

region, New Zealand **

Wellington Wellington ( mi, Te Whanganui-a-Tara or ) is the capital city of New Zealand. It is located at the south-western tip of the North Island, between Cook Strait and the Remutaka Range. Wellington is the second-largest city in New Zealand by me ...

region, New Zealand * Tahiti **

Tautira Tautira is a Polynesian beach village, valley, and point on the south-east coast of the island of Tahiti in the Pacific. It is part of the commune Taiarapu-Est. With a population of 2338 (in 2007), it is located 49 kilometres southeast of the Tah ...

Point Venus Point Venus is a peninsula on the north coast of Tahiti, the largest island in the Windward group of French Polynesia. It is in the commune of Mahina, approximately 8 km east of the capital Pape'ete. It lies at the northeast end of Matav ...

* Papua New Guinea ** Gulf of Papua

Indian Ocean

* South coast of

Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...

, Indonesia (

ironsand Ironsand, also known as iron-sand or iron sand, is a type of sand with heavy concentrations of iron. It is typically dark grey or blackish in colour. It is composed mainly of magnetite, Fe3O4, and also contains small amounts of titanium, silic ...

)

References

{{Authority control Sand Economic geology Sediments