Anhydrite and Gypsum Indiana’S Evaporite Minerals

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Anhydrite and Gypsum Indiana’s Evaporite Minerals Gypsum (CaSO4.2H2O) and anhydrite (CaSO4) are two related minerals that formed in Indiana during periodic episodes of ancient sea water evaporation in restricted basins. Large deposits of both minerals are located in northwestern and southwestern satin spar gypsum Indiana. These deposits are commonly associated with dolostone and limestone. Anhydrite converts to gypsum when exposed to water, which creates a volume increase that destroys any planar features in the beds. The reverse is also possible—anhydrite can be created when gypsum is dehydrated. Both minerals display vitreous luster and are white in color and streak. The calcium in either mineral may be substituted by small amounts of strontium and barium. But gypsum and anhydrite have differing physical charac- teristics that can help to identify them. Gypsum is soft and can be scratched with a fingernail. It has four different cleavage surfaces, and its crystals display a variety of forms, the most common being a granular, massive rock known as alabaster. Another type, selenite, is a transparent crystalline material that forms large, well-developed crystals. Aggregates of fibrous gypsum form a variety called satin spar. Although associated with gypsum, anhydrite lacks H2O molecules. Anhydrite closely resembles gypsum in hand samples, but it has three cleavage planes at 90 degree angles. In addition, anhydrite is slightly harder and denser compared with gypsum and may have a bluish tint. Both gypsum and anhydrite are used as soil additives and gypsum crystals in portland cement. Because of its use in drywall manufacturing, gypsum is bluish anhydrite with calcite more economically desirable. MOHS HARDNESS SCALE SOFTEST 1 TALC 2 GYPSUM FINGERNAIL 3 CALCITE ANHYDRITE COPPER COIN 4 FLUORITE Gypsum Crystals 611 North Walnut Grove Ave. Bloomington, Indiana 47405 (812) 855-7636 5 APATITE [email protected] KNIFE / GLASS IGS.indiana.edu 6 FELDSPAR 7 QUARTZ Analyzing the Past to STEEL TOOL HARDEST 8 TOPAZ Anhydrite Crystal Provide for the Future 9 CORUNDUM 10 DIAMOND.

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Download PDF About Minerals Sorted by Mineral Name
MINERALS SORTED BY NAME Here is an alphabetical list of minerals discussed on this site. More information on and photographs of these minerals in Kentucky is available in the book “Rocks and Minerals of Kentucky” (Anderson, 1994). APATITE Crystal system: hexagonal. Fracture: conchoidal. Color: red, brown, white. Hardness: 5.0. Luster: opaque or semitransparent. Specific gravity: 3.1. Apatite, also called cellophane, occurs in peridotites in eastern and western Kentucky. A microcrystalline variety of collophane found in northern Woodford County is dark reddish brown, porous, and occurs in phosphatic beds, lenses, and nodules in the Tanglewood Member of the Lexington Limestone. Some fossils in the Tanglewood Member are coated with phosphate. Beds are generally very thin, but occasionally several feet thick. The Woodford County phosphate beds were mined during the early 1900s near Wallace, Ky. BARITE Crystal system: orthorhombic. Cleavage: often in groups of platy or tabular crystals. Color: usually white, but may be light shades of blue, brown, yellow, or red. Hardness: 3.0 to 3.5. Streak: white. Luster: vitreous to pearly. Specific gravity: 4.5. Tenacity: brittle. Uses: in heavy muds in oil-well drilling, to increase brilliance in the glass-making industry, as filler for paper, cosmetics, textiles, linoleum, rubber goods, paints. Barite generally occurs in a white massive variety (often appearing earthy when weathered), although some clear to bluish, bladed barite crystals have been observed in several vein deposits in central Kentucky, and commonly occurs as a solid solution series with celestite where barium and strontium can substitute for each other. Various nodular zones have been observed in Silurian–Devonian rocks in east-central Kentucky.
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