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Alunite ... alumstone |
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hydrous sulfate of aluminum and potassium: KAl3(SO4)2(OH)6 |
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Crystallography: Hexagonal, usually massive crystals are rare |
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Colors: white, gray, pink |
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Luster: vitreous to pearly,translucent to transparent Hardness: 3.5 - 4 |
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Specific gravity: 2.6 - 2.9 |
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Fracture: flat conchoidal to uneven, brittle |
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Cleavage: basal, brittle, conchoidal to uneven |
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Occurrence: altered orthoclase feldspar rich rocks, massive alunite |
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Crystal or stone size: massive crystals are rare |
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Comments: sometimes florescent orange in LW UV; closely resembles limestone and dolomite; a mountain of alunite is in Marysvale Utah |
