Alabaster is a name applied to varieties of two distinct
minerals: gypsum(a hydrous sulfate of calcium) and calcite(a carbonateof calcium). The former is the alabaster of the present day; the latter is generally the alabaster of the ancients.
The two kinds are readily distinguished from each other by their relative hardnesses. The gypsum kind is so soft as to be readily scratched by a finger-nail (Mohs hardness 1.5 to 2), while the calcite kind is too hard to be scratched in this way (Mohs hardness 3), though it does yield readily to a knife. Moreover, the calcite alabaster, being a
carbonate, effervesces on being touched with hydrochloric acid, whereas the gypsum alabaster, when so treated, remains practically unaffected.
Due to the characteristic color of white alabaster, the term has entered the vernacular as a metonym for white things, particularly "alabaster skin". The usage as whiteness also occurs in a line from the poem and song, "
America the Beautiful".
The origin of alabaster is in Middle English, through Old French "alabastre", in turn derived from
Latin"alabaster" and that from Greek "αλάβαστρος" ("alabastros") or "αλάβαστος" ("alabastos"), the latter being the word for a vase made of alabaster. This may further derive from the ancient Egyptian word "a-labaste" (vessel of the Egyptian goddess Bast). [ [http://www.yourdictionary.com/alabaster alabaster - definition at YourDictionary ] ] [ [http://www.m-w.com/dictionary/alabaster alabaster - Definition from the Merriam-Webster Online Dictionary ] ] It has been suggested that the name was derived from the town of Alabastronin Egypt, while an Arabic etymological origin has also been suggested. [ [http://www.1911encyclopedia.org/Alabaster Alabaster] , " Encyclopædia Britannica Eleventh Edition"]
This substance, the "alabaster" of the
Bible, is often termed "Oriental alabaster", since the early examples came from the Far East. The Greek name "alabastrites" is said to be derived from the town of Alabastron, in Egypt, where the stone was quarried, but the locality probably owed its name to the mineral; the origin of the mineral name is obscure. This "Oriental" alabaster was highly esteemed for making small perfume bottles or ointment vases called alabastra, and this has been conjectured to be a possible source of the name. Alabaster was also employed in Egypt for canopic jars and various other sacred and sepulchral objects. A splendid sarcophagus, sculptured in a single block of translucent calcite alabaster from Alabastron, is in the Soane Museum, London. This was discovered by Giovanni Belzoniin 1817in the tomb of Seti Inear Thebes. It was purchased by Sir John Soane, having previously been offered to the British Museum.
When cut in thin sheets, alabaster is translucent enough to be used for small windows, and has been used so in
medievalchurches, especially in Italy. Large alabaster sheets are used extensively in the Cathedral of Our Lady of the Angels(dedicated 2002) of the Los Angeles (California) Archdiocese. The cathedral incorporates special cooling to prevent the panes from overheating and turning opaque.
Calcite alabaster is either a stalagmitic deposit, from the floor and walls of
limestone caverns, or a kind of travertine, similarly deposited in springs of calcareous water. Its deposition in successive layers gives rise to the banded appearance that the marble often shows on cross-section, whence it is known as onyx-marble or alabaster-onyx, or sometimes simply as onyx— a term which should, however, be restricted to siliceous minerals. Egyptian alabaster has been extensively worked near Suezand near Assiut; there are many ancient quarries in the hills overlooking the plain of Tell el Amarna. The Algerian onyx-marble has been largely quarried in the province of Oran. In Mexico, there are famous deposits of a delicate green variety at La Pedrara, in the district of Tecali, near Puebla. Onyx-marble occurs also in the district of Tehuacánand at several localities in California, Arizona, Utah, Coloradoand Virginia.
In the present day, when the term "alabaster" is used without any qualification, it invariably means a fine-grained variety of gypsum. This mineral, or alabaster proper, occurs in
England. However, thousands of gypsum alabaster artifacts dating to the late 4th millennium BChave been found in Tell Brak(present day Nagar), in Syria[http://www.metmuseum.org/Works_of_Art/viewOne.asp?dep=3&item=1988.323.8&viewmode=0&isHighlight=1] . And in Mesopotamia, a gypsum alabaster sculpture, believed to represent the god Abu, dates to the first half of the 3rd millennium BC[http://www.metmuseum.org/Works_of_Art/viewOne.asp?dep=3&viewmode=0&item=40%2E156] .
Mineral alabaster occurs in
Englandin the Keuper marls of the Midlands, especially at Chellastonin Derbyshire, at Fauldin Staffordshireand near Newark in Nottinghamshire. All these localities have been extensively worked. In the 15th centuryits carving into iconsand altarpieces was a valuable local industry in Nottingham, as well as a major English export. Besides examples of these still in Britain (especially at the Nottingham Castle Museum, British Museumand Victoria and Albert Museum), that trade in itself (rather than just the antiques trade) has scattered examples as far afield as the Musée de Cluny, Spain and Scandinavia.
Alabaster is also found, though in subordinate quantity, at
Watchetin Somerset, near Penarthin Glamorganshire, and elsewhere. In Cumbriait 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 alabaster is known as "Patrick," it has been worked into ornaments under the name of "Derbyshire spar" — a term more properly applied to fluorspar.
"Black Alabaster" is a rare form of the gypsum-based mineral found in only three veins in the world, one each in
Oklahoma(USA), Italy, and the People's Republic of China. Alabaster Caverns State Park, near Freedom, Oklahomais home to a natural gypsum cavein 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.
The finer kinds of alabaster are largely employed as an
ornamental stone, especially for ecclesiasticaldecoration and for the rails of staircases and halls. Its softness enables it to be readily carved into elaborate forms, but its solubility in water renders it inapplicable to outdoor work. The purest alabaster is a snow-white material of fine tiniforni grain, but it is often associated with an oxide of iron, which produces brown clouding and veining in the stone. The coarser varieties of alabaster are converted by calcination into plaster of Paris, whence they are sometimes known as "plaster stone."
On the continent of
Europe, the centre of the alabaster trade is Florence, Italy. Tuscan alabaster occurs in nodular masses embedded in limestone, interstratified with marls of Mioceneand Plioceneage. The mineral is largely worked by means of underground galleries, in the district of Volterra. Several varieties are recognized — veined, spotted, clouded, agatiform, and others. The finest kind, obtained principally from Castellina, is sent to Florence for figure-sculpture, while the common kinds are carved at a very cheap rate locally into vases, clock-cases and various ornamental objects, in which a large trade is carried on, especially in Florence, Pisaand Livorno.
In order to diminish the translucency of the alabaster and to produce an opacity suggestive of true marble, the statues are immersed in a bath of water and gradually heated nearly to the boiling-point — an operation requiring great care, for if the temperature is not carefully regulated, the stone acquires a dead-white, chalky appearance. The effect of heating appears to be a partial dehydration of the gypsum. If properly treated, it very closely resembles true marble and is known as
marmo di Castellina. Sulphate of lime (gypsum) was used also by the ancients, and was employed, for instance, in Assyrian sculpture, so that some of the ancient alabaster is identical with the modern stone.
Alabaster may be stained by digesting it, after being heated in various pigmentary solutions. In this way a good imitation of coral has been produced (alabaster coral).
J. A. Harrell, "Misuse of the term 'alabaster' in
Egyptology," "Göttinger Miszellen", v. 119, 1990, pp. 37-42.
List of minerals
* [http://www.alabastroinvolterra.it/ Alabaster Craftmanship in Volterra]
* [http://www.arteinbottegavolterra.it/ Alabaster Craftsmen Association "ArteInBottega"]
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Alabaster — massiges Aggregat Chemische Formel CaSO4 · 2 H2O Mineralklasse Wasserhaltige Sulfate ohne fremde Anionen siehe Gips (nach Strunz) siehe Gips … Deutsch Wikipedia
Alabaster — • The substance commonly known as alabaster is a fine grained variety of gypsum. Oriental alabaster, the alabastrites of the classical writers, is a translucent marble obtained from stalagmitic deposits Catholic Encyclopedia. Kevin Knight. 2006.… … Catholic encyclopedia
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