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Sapphirine

From Geology Wiki

Sapphirine
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Pronunciation
Rock/Mineral Mineral
Type Mineral
Cleavage
Hardness 7.5
Streak White
Lustre
Specific Gravity
Chemical Compound (Mg,Al)8(Al,Si)6O20


Sapphirine is a rare mineral. These minerals are generally found in environments poor in silica and fluent with magnesium and aluminum.