Observe the mineral below and identify it. When tested for hardness, a penny does not scratch it but glass does.
O A. Taenite: No cleavage, hackly fracture, metallic luster, no reaction to acid, gray streak, hardness 5
B. Olivine: 2 planes of cleavage at 90 degree angles, glassy luster, no reaction to acid, no streak, hardness 6.5
C. Calcite: 3 planes of cleavage, glassy luster, reacts to acid, white streak, hardness 3.
D. Plagioclase Feldspar: 2 planes of cleavage at 90 degree angles, pearly luster, no reaction to acid, white streak, hardness 6.5
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Observe the mineral below and identify it. When tested for hardness, a penny does not scratch it but...
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