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Sunstone
Sunstone is a microcline or oligoclase feldspar, which when viewed from certain directions exhibits a spangled appearance. It has been found in Southern Norway, Sweden, various United States localities and on some beaches along the midcoast of South Australia. Properties Physical properties The optical effect is due to reflections from inclusions of red copper, hematite, or goethite, in the form of minute scales, which are hexagonal, rhombic, or irregular in shape, and are disposed parallel to the principal cleavage-plane. These inclusions give the stone an appearance something like that of aventurine, hence sunstone is known also as "aventurine-feldspar". The optical effect is called schiller and the color of Oregon Sunstone is due to copper. The middle part of this crystal sparkles, and usually the color is darkest in the middle and becomes lighter toward the outer edges. The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunstone2
Sunstone is a microcline or oligoclase feldspar, which when viewed from certain directions exhibits a spangled appearance. It has been found in Southern Norway, Sweden, various United States localities and on some beaches along the midcoast of South Australia. Properties Physical properties The optical effect is due to reflections from inclusions of red copper, hematite, or goethite, in the form of minute scales, which are hexagonal, rhombic, or irregular in shape, and are disposed parallel to the principal cleavage-plane. These inclusions give the stone an appearance something like that of aventurine, hence sunstone is known also as "aventurine-feldspar". The optical effect is called schiller and the color of Oregon Sunstone is due to copper. The middle part of this crystal sparkles, and usually the color is darkest in the middle and becomes lighter toward the outer edges. The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plush, Oregon
Plush is an unincorporated rural community and census-designated place in the Warner Valley of Lake County, in the U.S. state of Oregon. As of the 2010 census it had a population of 57. The community is in an arid, sparsely populated part of the state by road northeast of Lakeview. The valley surrounding Plush contains many marshes and shallow lakes, most of them intermittent. Frequented by Native Americans for many thousands of years, the valley became a region of sheep grazing and cattle ranching by the late 19th century. Plush's infrastructure includes a store, an elementary school, and a church. Nearby attractions include Hart Mountain National Antelope Refuge, Warner Wetlands, and the Oregon Sunstone Public Collection Area. History People have lived in the Warner Valley for more than 10,000 years. Evidence of Native American occupation includes petroglyphs, hunting blinds, flakes from obsidian tools, and other material artifacts. By historic times, the Kidütök ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aventurescence
In gemology, aventurescence (sometimes called aventurization) is an optical reflectance effect seen in certain gems. The effect amounts to a metallic glitter, arising from minute, preferentially oriented mineral platelets within the material. These platelets are so numerous that they also influence the material's body colour. In aventurine quartz chrome-bearing fuchsite produces a green stone, and various iron oxide Iron oxides are chemical compounds composed of iron and oxygen. Several iron oxides are recognized. All are black magnetic solids. Often they are non-stoichiometric. Oxyhydroxides are a related class of compounds, perhaps the best known of wh ...s produce a red stone. The words ''aventurine'' and ''aventurescence'' derive from the Italian "a ventura", meaning "by chance". This is an allusion to the chance discovery of aventurine glass or goldstone at some point in the 18th century. Goldstone is still manufactured today as an artificial imitation of later disco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tvedestrand
is municipality in Agder county, Norway. It is located in the traditional district of Sørlandet. The administrative center is the town of Tvedestrand. There are many villages in the municipality including Dypvåg, Fiane, Gjeving, Gødderstad, Grønland, Kilen, Klåholmen, Krokvåg, Laget, Lyngør, Nesgrenda, Østerå, Sagesund, Sandvika, and Songe. The town of Tvedestrand has a white-painted town center with irregular streets climbing steep hills around the harbor. The natural environment of the area makes it a tourist destination. The municipality includes numerous islands, which makes it popular in the summer for boaters. The number of people in the municipality practically doubles in the summer, due to vacationers. There are approximately 1,700 summer cottages ("hytter") around the fjord and coastal areas. Tvedestrand has over 2,000 buildings that are more than 100 years old. The municipality is the 298th largest by area out of the 356 municipalities in Norwa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microcline Or Oligoclase And Orthoclase
Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that forms as a result of the transformation of monoclinic orthoclase into triclinic microcline. The chemical compound name is potassium aluminium silicate, and it is known as E number reference E555. Geology Microcline may be chemically the same as monoclinic orthoclase, but because it belongs to the triclinic crystal system, the prism angle is slightly less than right angles; hence the name "microcline" from the Greek "small slope." It is a fully ordered tricl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthoclase
Orthoclase, or orthoclase feldspar ( endmember formula K Al Si3 O8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar. The gem known as moonstone (see below) is largely composed of orthoclase. Formation and subtypes Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite. Typically, the pure potassium endmember of orthoclase forms a solid solution with albite, the sodium endmember (NaAlSi3O8), of plagioclase. While slowly cooling within the earth, sodium-rich albite lamellae form by exsolution, enriching the remaining orthoclase with potassium. The resulting intergrowth of the two feldspars is called perthite. The higher-temperature polymorph of KAlSi3O8 is sanidine. Sanidine is common in ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crown Point, New York
Crown Point is a town in Essex County, New York, United States, located on the west shore of Lake Champlain. The population was 2,024 at the 2010 census. The name of the town is a direct translation of the original French name, . The town is on the eastern edge of Essex County. It is southwest of Burlington, Vermont, northeast of Queensbury, south of Montreal, Quebec and north of Albany. History Two European forts were built by colonists because of its strategic location at the narrows of Lake Champlain. The forts preceded organization of the town by more than half a century: first was Fort Saint-Frédéric built by the French in 1731, who came to this area from their colonial settlements to the north at Quebec and Montreal. They competed with the British for the fur trade with Native Americans in the area. During the Seven Years' War (known as the French and Indian War in North America), the British gained control of this area. Before that, the French retreated and destr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Small Polished Sunstone
A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey a and single-storey ɑ. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English grammar, " a", and its variant " an", are indefinite articles. History The earliest certain ancestor of "A" is aleph (also written 'aleph), the first letter of the Phoenician alphabet, which consisted entirely of consonants (for that reason, it is also called an abjad to distinguish it f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Statesville, North Carolina
Statesville is a city in and the county seat of Iredell County, North Carolina, United States, and it is part of the Charlotte metropolitan area. Statesville was established in 1789 by an act of the North Carolina Legislature. The population was recorded as 95 in the 1800 Census. The population was 28,419 at the time of the 2020 census. History In 1753, Scots-Irish Presbyterians and German Lutherans, who had originally settled in Pennsylvania, began arriving in what would become Statesville in 1789Keever, Homer M.; ''Iredell Piedmont County'', with illustrations by Louise Gilbert and maps by Mild red Jenkins Miller, published for the Iredell County Bicentennial Commission by Brady Printing Company from type set by the Statesville Record and Landmark, copyright, November 1976 to plant crops in the fertile soil where game and water were also plentiful. The settlement, known as Fourth Creek Congregation, was named for the freshwater stream running to the north of the present-day ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middletown Township, Delaware County, Pennsylvania
Middletown Township is a township in Delaware County, Pennsylvania, United States. The population was 15,807 at the 2010 census. The Pennsylvania State University has an undergraduate satellite campus called Penn State Brandywine located in the north-central portion of the township. Originally established in 1686, Middletown Township adopted a Home Rule Charter in 1978. The township is governed by the council-manager system, a representative form of government in which the seven elected officials set policy for the township and the manager oversees the delivery of all public services and programs. History Middletown Township was probably established as a township in 1686, but it is first mentioned in 1687 when John Martin was established as constable. The name of the township is believed to be derived from its position in the middle or central of Chester County where it resided until 1789 when Delaware County was created from the eastern portion of Chester County. Delaware Cou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siberia
Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive region, geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a part of Russia since the latter half of the 16th century, after the Russians Russian conquest of Siberia, conquered lands east of the Ural Mountains. Siberia is vast and sparsely populated, covering an area of over , but home to merely one-fifth of Russia's population. Novosibirsk, Krasnoyarsk and Omsk are the largest cities in the region. Because Siberia is a geographic and historic region and not a political entity, there is no single precise definition of its territorial borders. Traditionally, Siberia extends eastwards from the Ural Mountains to the Pacific Ocean, and includes most of the drainage basin of the Arctic Ocean. The river Yenisey divides Siberia into two parts, Western Siberia, Western and Eastern Siberia, Eastern. Siberia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Baikal
Lake Baikal (, russian: Oзеро Байкал, Ozero Baykal ); mn, Байгал нуур, Baigal nuur) is a rift lake in Russia. It is situated in southern Siberia, between the federal subjects of Irkutsk Oblast to the northwest and the Republic of Buryatia to the southeast. With of water, Lake Baikal is the world's largest freshwater lake by volume, containing 22–23% of the world's fresh surface water, more than all of the North American Great Lakes combined. It is also the world's deepest lake, with a maximum depth of , and the world's oldest lake, at 25–30 million years. At —slightly larger than Belgium—Lake Baikal is the world's seventh-largest lake by surface area. It is among the world's clearest lakes. Lake Baikal is home to thousands of species of plants and animals, many of them endemic to the region. It is also home to Buryat tribes, who raise goats, camels, cattle, sheep, and horses on the eastern side of the lake, where the mean tempera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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