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Windows to the Universe/L.Gardiner
Find out how to identify minerals (...and learn what shape, luster, color, streak, hardness, cleavage and fracture are all about!)
Meet some other nonsilicate minerals!
This is gypsum! It often forms as a layer of the bottom of a salty sea. Sometimes it forms in sandy areas like deserts and little sand grains are trapped between the gypsum crystals. This makes the crystals look like they are made out of sand.
There is probably some gypsum in your house and school! Gypsum is in plaster, which is used to make walls and molds of your teeth at the orthodontist's office.
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The Fall 2010 issue of The Earth Scientist
, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
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