mineral
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Mi ...
and a soft
rock
Rock most often refers to:
* Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids
* Rock music, a genre of popular music
Rock or Rocks may also refer to:
Places United Kingdom
* Rock, Caerphilly, a location in Wale ...
used for carvings and as a source of
plaster
Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of buildings, while "re ...
powder. Archaeologists, geologists, and the stone industry have different definitions for the word ''alabaster''. In archaeology, the term ''alabaster'' includes objects and artefacts made from two different minerals: (i) the fine-grained, massive type of
gypsum
Gypsum is a soft sulfate mineral composed of calcium sulfate Hydrate, dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk ...
, and (ii) the fine-grained, banded type of
calcite
Calcite is a Carbonate minerals, carbonate mineral and the most stable Polymorphism (materials science), polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on ...
.''More About Alabaster and Travertine'': Brief Guide explains the different definitions used by geologists, archaeologists, and the stone trade. Oxford University Museum of Natural History, 2012 /ref>
Chemically, gypsum is a Water of crystallization, hydrous
sulfate
The sulfate or sulphate ion is a polyatomic anion with the empirical formula . Salts, acid derivatives, and peroxides of sulfate are widely used in industry. Sulfates occur widely in everyday life. Sulfates are salts of sulfuric acid and many ...
of
calcium
Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to it ...
, whereas calcite is a
carbonate
A carbonate is a salt of carbonic acid, (), characterized by the presence of the carbonate ion, a polyatomic ion with the formula . The word "carbonate" may also refer to a carbonate ester, an organic compound containing the carbonate group ...
of calcium. As types of alabaster, gypsum and calcite have similar properties, such as light color, translucence, and soft stones that can be carved and sculpted; thus the historical use and application of alabaster for the production of carved, decorative artefacts and '' objets d’art''."Grove": R. W. Sanderson and Francis Cheetham. "Alabaster",
Grove Art Online
''Grove Art Online'' is the online edition of ''The Dictionary of Art'', often referred to as the ''Grove Dictionary of Art'', and part of Oxford Art Online, an internet gateway to online art reference publications of Oxford University Press, ...
, Oxford Art Online, Oxford University Press, accessed 13 March 2013 subscriber link Calcite alabaster also is known as onyx-marble, Egyptian alabaster, and Oriental alabaster, which terms usually describe either a compact, banded
travertine
Travertine ( ) is a form of terrestrial limestone deposited around mineral springs, especially hot springs. It often has a fibrous or concentric appearance and exists in white, tan, cream-colored, and rusty varieties. It is formed by a process ...
limestone
Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of the material Lime (material), lime. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science) ...
colored with swirling bands of cream and brown.
In general, ancient alabaster is calcite in the wider
Middle East
The Middle East (term originally coined in English language) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq.
The term came into widespread usage by the United Kingdom and western Eur ...
, including
Egypt
Egypt ( , ), officially the Arab Republic of Egypt, is a country spanning the Northeast Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to northe ...
and
Mesopotamia
Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...
, while it is gypsum in medieval
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
. Modern alabaster is most likely calcite but may be either. Both are easy to work and slightly soluble in water. They have been used for making a variety of indoor artwork and carving, as they will not survive long outdoors.
The two types are readily distinguished by their different hardness: gypsum alabaster (
Mohs hardness
The Mohs scale ( ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of mineral
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fair ...
1.5 to 2) is so soft that a fingernail scratches it, while calcite (Mohs hardness 3) cannot be scratched in this way but yields to a knife. Moreover, calcite alabaster, being a carbonate, effervesces when treated with
hydrochloric acid
Hydrochloric acid, also known as muriatic acid or spirits of salt, is an aqueous solution of hydrogen chloride (HCl). It is a colorless solution with a distinctive pungency, pungent smell. It is classified as a acid strength, strong acid. It is ...
while gypsum alabaster remains almost unaffected. Endnotes:
* M. Carmichael, ''Report on the Volterra Alabaster Industry'', Foreign Office, Miscellaneous Series, No. 352 (London, 1895)
* A. T. Metcalfe, "The Gypsum Deposits of Nottingham and Derbyshire," ''Transactions of the Federated Institution'', vol. xii. (1896), p. 107
* J. G. Goodchild, "The Natural History of Gypsum," ''Proceedings of the Geologists' Association'', vol. x. (1888), p. 425
* George P. Merrill, "The Onyx Marbles," ''Report of the U. S. National Museum for 1893'', p. 539.
Etymology
The English word "alabaster" was borrowed from Old French ', in turn derived from
Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
', and that from
Greek
Greek may refer to:
Anything of, from, or related to Greece, a country in Southern Europe:
*Greeks, an ethnic group
*Greek language, a branch of the Indo-European language family
**Proto-Greek language, the assumed last common ancestor of all kno ...
' (') or ' ('). The Greek words denoted a vase of alabaster.
The name may be derived further from
ancient Egyptian
Ancient Egypt () was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150BC (according to conventional Egyptian chronology), when Upper and Lower E ...
', which refers to vessels of the Egyptian goddess Bast. She was represented as a lioness and frequently depicted as such in figures placed atop these alabaster vessels. Ancient Roman authors
Pliny the Elder
Gaius Plinius Secundus (AD 23/24 79), known in English as Pliny the Elder ( ), was a Roman Empire, Roman author, Natural history, naturalist, and naval and army commander of the early Roman Empire, and a friend of the Roman emperor, emperor Vesp ...
and
Ptolemy
Claudius Ptolemy (; , ; ; – 160s/170s AD) was a Greco-Roman mathematician, astronomer, astrologer, geographer, and music theorist who wrote about a dozen scientific treatises, three of which were important to later Byzantine science, Byzant ...
wrote that the stone used for ointment jars called ''alabastra'' came from a region of Egypt known as Alabastron or Alabastrites.
Properties and usability
The purest alabaster is a snow-white material of fine uniform grain, but it often is associated with an oxide of
iron
Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...
, which produces brown clouding and veining in the stone. The coarser varieties of gypsum alabaster are converted by calcination into
plaster of Paris
Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of buildings, while "re ...
, and are sometimes known as "plaster stone".
The softness of alabaster enables it to be carved readily into elaborate forms, but its solubility in water renders it unsuitable for outdoor work. If alabaster with a smooth, polished surface is washed with
dishwashing liquid
Dishwashing liquid (washing-up liquid or fairy liquid in British English), also known as dishwashing soap, dish detergent, or dish soap, is a detergent used in dishwashing. Dishwashing detergent for dishwashers comes in various forms such a ...
, it will become rough, dull and whiter, losing most of its translucency and lustre. The finer kinds of alabaster are employed largely as an ornamental stone, especially for
ecclesiastical
{{Short pages monitor
Gypsum alabaster is a common mineral, which occurs in England in the Keuper
marl
Marl is an earthy material rich in carbonate minerals, Clay minerals, clays, and silt. When Lithification, hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae.
M ...
s of the
Midlands
The Midlands is the central region of England, to the south of Northern England, to the north of southern England, to the east of Wales, and to the west of the North Sea. The Midlands comprises the ceremonial counties of Derbyshire, Herefor ...
Derbyshire
Derbyshire ( ) is a ceremonial county in the East Midlands of England. It borders Greater Manchester, West Yorkshire, and South Yorkshire to the north, Nottinghamshire to the east, Leicestershire to the south-east, Staffordshire to the south a ...
, at Fauld in
Staffordshire
Staffordshire (; postal abbreviation ''Staffs''.) is a Ceremonial counties of England, ceremonial county in the West Midlands (region), West Midlands of England. It borders Cheshire to the north-west, Derbyshire and Leicestershire to the east, ...
Nottinghamshire
Nottinghamshire (; abbreviated ''Notts.'') is a ceremonial county in the East Midlands of England. The county is bordered by South Yorkshire to the north-west, Lincolnshire to the east, Leicestershire to the south, and Derbyshire to the west. Th ...
. Deposits at all of these localities have been worked extensively.
In the 14th and 15th centuries the carving into small statues and sets of
relief
Relief is a sculpture, sculptural method in which the sculpted pieces remain attached to a solid background of the same material. The term ''wikt:relief, relief'' is from the Latin verb , to raise (). To create a sculpture in relief is to give ...
panels for
altarpiece
An altarpiece is a painting or sculpture, including relief, of religious subject matter made for placing at the back of or behind the altar of a Christian church. Though most commonly used for a single work of art such as a painting or sculpture, ...
s was a valuable local industry in Nottingham, as well as a major English export. These were usually painted, or partly painted. It was also used for the effigies, often life size, on
tomb monument
A tomb ( ''tumbos'') or sepulchre () is a repository for the remains of the dead. It is generally any structurally enclosed interment space or burial chamber, of varying sizes. Placing a corpse into a tomb can be called '' immurement'', alth ...
s, as the typical recumbent position suited the material's lack of strength, and it was cheaper and easier to work than good marble. After the
English Reformation
The English Reformation began in 16th-century England when the Church of England broke away first from the authority of the pope and bishops Oath_of_Supremacy, over the King and then from some doctrines and practices of the Catholic Church ...
the making of altarpiece sets was discontinued, but funerary monument work in reliefs and statues continued.
In addition to the carvings still in Britain (particularly the Nottingham Castle Museum,
British Museum
The British Museum is a Museum, public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is the largest in the world. It documents the story of human cu ...
, and
Victoria and Albert Museum
The Victoria and Albert Museum (abbreviated V&A) in London is the world's largest museum of applied arts, decorative arts and design, housing a permanent collection of over 2.8 million objects. It was founded in 1852 and named after Queen ...
), trade in mineral alabaster (other than the antiques trade) is ongoing as far afield as the Musée de Cluny, Spain, and Scandinavia.
Alabaster is also found, in smaller quantity, at Watchet in
Somerset
Somerset ( , ), Archaism, archaically Somersetshire ( , , ) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east ...
, near
Penarth
Penarth ( , ) is a town and Community (Wales), community in the Vale of Glamorgan, Wales, approximately south of Cardiff city centre on the west shore of the Severn Estuary at the southern end of Cardiff Bay.
Penarth is a Seaside resort#Brit ...
Cumbria
Cumbria ( ) is a ceremonial county in North West England. It borders the Scottish council areas of Dumfries and Galloway and Scottish Borders to the north, Northumberland and County Durham to the east, North Yorkshire to the south-east, Lancash ...
it occurs largely in the New Red rocks, but at a lower geological horizon. The alabaster of Nottinghamshire and Derbyshire is found in thick nodular beds or "floors" in spheroidal masses known as "balls" or "bowls" and in smaller lenticular masses termed "cakes". At Chellaston, where the local alabaster is known as "Patrick", it has been worked into ornaments under the name of "Derbyshire spar"―a term more properly applied to
fluorspar
Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon.
The Mohs scal ...
.
Black alabaster
''Black alabaster'' is a rare anhydrite form of the gypsum-based mineral. The black form is found in only three veins in the world, one each in
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
,
Italy
Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
, and
China
China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
.
Alabaster Caverns State Park, near Freedom, Oklahoma, is home to a natural gypsum cave in which much of the gypsum is in the form of alabaster. There are several types of alabaster found at the site, including pink, white, and the rare black alabaster.
Euphrates
The Euphrates ( ; see #Etymology, below) is the longest and one of the most historically important rivers of West Asia. Tigris–Euphrates river system, Together with the Tigris, it is one of the two defining rivers of Mesopotamia (). Originati ...
, made of gypsum alabaster (25th century BC)
File:Statuette_Goddess_Louvre_AO20127.jpg, Necropolis of Hillah, near
Babylon
Babylon ( ) was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about south of modern-day Baghdad. Babylon functioned as the main cultural and political centre of the Akkadian-s ...
. Alabaster, gold,
terracotta
Terracotta, also known as terra cotta or terra-cotta (; ; ), is a clay-based non-vitreous ceramic OED, "Terracotta""Terracotta" MFA Boston, "Cameo" database fired at relatively low temperatures. It is therefore a term used for earthenware obj ...
and rubies. Musée du Louvre
Statue Ammaalay Louvre AO20282.jpg, Alabaster statue,
Yemen
Yemen, officially the Republic of Yemen, is a country in West Asia. Located in South Arabia, southern Arabia, it borders Saudi Arabia to Saudi Arabia–Yemen border, the north, Oman to Oman–Yemen border, the northeast, the south-eastern part ...
Derbyshire
Derbyshire ( ) is a ceremonial county in the East Midlands of England. It borders Greater Manchester, West Yorkshire, and South Yorkshire to the north, Nottinghamshire to the east, Leicestershire to the south-east, Staffordshire to the south a ...
, England
File:Fossanova Abbey fc02.jpg, Alabaster windows in the choir of Fossanova Abbey church (12th century) in
Latina, Italy
Latina () is the capital of the province of Latina, in the Lazio region, in Central Italy. As of 2024, the city has 127,486 inhabitants and is the second-largest city of the region, after the national capital Rome.It is one of the youngest citie ...
File:Casamari coro.jpg, Alabaster windows and rosette in the central apse of Casamari Abbey church (1203–1217) in
Lazio
Lazio ( , ; ) or Latium ( , ; from Latium, the original Latin name, ) is one of the 20 Regions of Italy, administrative regions of Italy. Situated in the Central Italy, central peninsular section of the country, it has 5,714,882 inhabitants an ...
, Italy
File:Orvieto083.jpg, Alabaster window in
Orvieto Cathedral
Orvieto Cathedral () is a large 14th-century Roman Catholic cathedral dedicated to the Assumption of the Virgin Mary and situated in the town of Orvieto in Umbria, central Italy. Since 1986, the cathedral in Orvieto has been the episcopal seat ...
(14th century), Italy
Modern
Archaizing Relief of a Seated King and Attendants, late 19th century.jpg, Archaizing Relief of a Seated King and Attendants,
Iran
Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
, Qajar period (late 19th century CE, in the style of 5th–4th century BC).
Brooklyn Museum
The Brooklyn Museum is an art museum in the New York City borough (New York City), borough of Brooklyn. At , the museum is New York City's second largest and contains an art collection with around 500,000 objects. Located near the Prospect Heig ...
Aachen Cathedral
Aachen Cathedral () is a Catholic Church, Catholic church in Aachen, Germany and the cathedral of the Diocese of Aachen.
One of the oldest cathedral buildings in Europe, it was constructed as the royal chapel of the Palace of Aachen of Holy Rom ...
* – mineral consisting of calcium carbonate (); archaeologists and stone trade professionals, unlike mineralogists, call one variety of calcite "alabaster"
* – mineral composed of calcium sulfate dihydrate (); alabaster is one of its varieties
** – a mineral closely related to gypsum
** – the main inorganic compound () of gypsum
* – translucent sheets of marble or alabaster used during the Early Middle Ages for windows instead of glass
*
Window and roof panels
Chronological list of examples:
* – 5th century, Ravenna
* – 6th century, Ravenna
* – mainly 13th–14th century, Valencia, Spain; the
lantern
A lantern is a source of lighting, often portable. It typically features a protective enclosure for the light sourcehistorically usually a candle, a oil lamp, wick in oil, or a thermoluminescence, thermoluminescent Gas mantle, mesh, and often a ...
of the octagonal crossing tower
* – 14th-century, Orvieto, Umbria, central Italy
* – 17th century, Rome; alabaster window by
Bernini
Gian Lorenzo (or Gianlorenzo) Bernini (, ; ; Italian Giovanni Lorenzo; 7 December 1598 – 28 November 1680) was an Italian sculptor and architect. While a major figure in the world of architecture, he was more prominently the leading sculptor ...
(1598–1680) used to create a "spotlight"
* – 1924, Jerusalem, architect: Antonio Barluzzi. Windows fitted with dyed alabaster panels.
* – 1924, Mount Tabor, architect: Antonio Barluzzi. Alabaster roofing was attempted.
References
Further reading
* Harrell J.A. (1990), "Misuse of the term 'alabaster' in
Egyptology
Egyptology (from ''Egypt'' and Ancient Greek, Greek , ''wiktionary:-logia, -logia''; ) is the scientific study of ancient Egypt. The topics studied include ancient Egyptian History of Egypt, history, Egyptian language, language, Ancient Egypt ...
", ''Göttinger Miszellen'', 119, pp. 37–42.
* Mackintosh-Smith T. (1999), "Moonglow from Underground". Aramco World May–June 199