anhydrite

A Dictionary of Earth Sciences | 1999 | 686 words | Copyright

anhydrite Mineral sulphate, CaSO₄, found in evaporite deposits; sp. gr. 2.9–3.0; hardness 3.0–3.5; orthorhombic; normally white to colourless, sometimes with a bluish tinge, but occasionally grey and reddish; white streak; vitreous to pearly lustre; crystals rare, the mineral being usually massive, granular, and fibrous; three cleavages at right angles, perfect {010}, good {100}, {001}; occurs with gypsum and halite, deposited directly from sea water at temperatures in excess of 42°C, can form from the dehydration of gypsum; may occur as a cap rock above salt domes, and as a minor gangue mineral in hydrothermal veins. It is used as a raw material for cements.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

AILSA ALLABY and MICHAEL ALLABY. "anhydrite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "anhydrite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-anhydrite.html

AILSA ALLABY and MICHAEL ALLABY. "anhydrite." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-anhydrite.html

Learn more about citation styles