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Gypsum

Gypsum

(Science: chemical) a mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.

Origin: L. Gypsum, gr.; cf. Ar. Jibs plaster, mortar, Per. Jabsn lime.

Its chemical formula is CaSO4•2H2O.


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The Fiber Disease

... rocks tell us that the hydrologic cycle was up and running and that the oceans were not entirely frozen at a very early date (around 3.8 Byr), gypsum crystals in ancient sediments indicate that the temperature could not have been too high since it is not stable above about 40°C. Occasional ...

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by London
Mon Jan 30, 2006 6:00 am
 
Forum: Human Biology
Topic: The Fiber Disease
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