BIOTITE MICA
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Luster: Nonmetallic |
Lab Book Description: |
Hardness: 2.5 to 3 |
Color black, green-black, or brown-black; Cleavage excellent; Forms very short prisms that split easily into very thin, flexible sheets; Specific Gravity = 2.7 to 3.1 |
Streak: Gray-brown |
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Appears on these flash cards: vitreous luster; one plane of perfect cleavage
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