HORNBLENDE
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Luster: Nonmetallic |
Lab Book Description: |
Hardness: 5.5 |
Color dark gray to black; Forms prisms with good cleavage at 60 and 120 degrees; Brittle; Splintery or asbestos forms; SG = 3.0 to 3.3 |
Streak: White to pale gray |
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Appears on these flash cards: hardness of > 5.5 (greater than 5.5); two planes of cleavage
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