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The Rock Professor has provided you with a mineral
information card. Print on stock paper, and cut out to
enhance your rock and mineral products.
To print: with your cursor, highlight the entire card below,
right click and select print, then click on "selection"
and print.
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THE ROCK PROFESSOR
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SELENITE
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Selenite is a transparent and colorless variety of the mineral gypsum. It is known for being so soft that it can be scratched with a fingernail. It has three unequal cleavages and is typically formed by evaporation of salt waters. It has been found in crystals over 40 feet long in localities in Mexico. Selenite is found in areas of Mexico and the U.S. in clusters of crystals resembling rosettes, popularly known as desert roses.
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Chemistry: hydrous calcium sulfate ♦ Variety of: gypsum ♦ transparent ♦
Luster: vitreous to pearly ♦ Crystal system: monoclinic prismatic ♦
Moh's hardness: 2 ♦ Color: Colorless ♦ Localities: Extensive deposits worldwide
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