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Mineral Properties and Uses

Physical Properties of Orthoclase

Chemical Classification silicate
Color white, gray, flesh pink, reddish, yellow, green
Streak white
Luster vitreous
Diaphaneity translucent to subtranslucent
Cleavage perfect
Mohs Hardness 6 to 6.5
Specific Gravity 2.5 to 2.6
Diagnostic Properties cleavage, color
Chemical Composition KAlSi3O8
Crystal System monoclinic
Uses gemstones, ceramics

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