Alabaster (sometimes called satin spar) is a name applied to varieties of two distinct minerals: gypsum (a hydrous sulfate of calcium) and the calcite (a carbonate of 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 (hardness 1.5 to 2), while the calcite kind is too hard to be scratched in this wa ...

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Alabaster - Calcite Alabaster Alabaster - Gypsum Alabaster

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Alabaster, Alabaster - Calcite Alabaster, Alabaster - Gypsum Alabaster

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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, and it has been suggested that it may have had an Arabic origin. This "Oriental" alabaster was highly esteemed for making small perfume-bottles or ointment vases called alabastra, and ...

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Alabaster, Alabaster - Calcite Alabaster, Alabaster - Gypsum Alabaster

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Alabaster Caverns State Park, near Freedom, Oklahoma is home to the largest natural gypsum cave in the world that is open to the public. The gypsum is mostly in the form of alabaster. There are several types of alabaster found at the site, including pink, white, and the rare black alabaster. This black alabaster can be found in only three veins in the world, one each in Oklahoma, Italy and China. Another form of gyp ...

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Alabaster Caverns State Park - Geology Alabaster Caverns State Park - Wildlife

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Gypsum occurs in nature as flattened and often twinned crystals and transparent cleavable masses called selenite. It may also occur silky and fibrous, in which case it is commonly called satin spar. Finally it may also be granular or quite compact. In hand-sized samples, it can be anywhere from transparent to opaque. A very fine-grained white or lightly-tinted variety of gypsum is called alabaster, which is prized for ornamental work of various sorts. In arid areas, gypsum can occur in a flower-like form typically opaque with emb ...

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Gypsum, Gypsum - Chemical structure, Gypsum - Occurrence, Gypsum - Uses, Gypsum - External link, Gypsum - Place names

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