Mineral: hardness: cleavage/fracture: luster:
obsidian5fracturevitreous
Halite2.5cubic clea...
Mineral: hardness: cleavage/fracture: luster:
obsidian5fracturevitreous
Halite2.5cubic cleavagevitreous
fluorite4octahedral---vitreous
use the table to answer the question.
An unknown mineral specimen is not scratched by a penny and doesn't exhibit cleavage. The mineral is most likely to be?
a. obsidian
b. halite
c. fluorite
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