Gypsum | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Gypsum


00:00:52 1 Etymology and history
00:02:25 2 Physical properties
00:03:20 3 Crystal varieties
00:04:26 4 Occurrence
00:06:39 5 Mining
00:08:07 6 Synthesis
00:09:32 7 Occupational safety
00:09:49 7.1 United States
00:10:35 8 Uses
00:13:12 9 Gallery
00:13:25 10 See also



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SUMMARY
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Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall.  A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite. It also forms as an evaporite mineral and as a hydration product of anhydrite.
The Mohs scale of mineral hardness defines hardness value 2 as gypsum based on scratch hardness comparison.