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Mineral Properties and Uses

Physical Properties of Plagioclase

Chemical Classification silicate
Color colorless, white, gray, bluish, greenish, yellowish, reddish
Streak white
Luster vitreous
Diaphaneity transparent to translucent
Cleavage perfect
Mohs Hardness 6 to 6.5
Specific Gravity 2.6 to 2.8
Diagnostic Properties cleavage
Chemical Composition NaAlSi3O8 CaAl2Si2O8
Crystal System triclinic
Uses decorative stone, moon stone, buildings

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