According to Moh's hardness scale, your fingernail would be rated as 2.5. Juan and Carol are trying to identify an unknown mineral. Carol can scratch the mineral sample with her fingernail. Juan and Carol know the mineral MUST be one of these four choices.
Based on the scratch test, the mineral is
A) apatite.
B) calcite.
C) gypsum.
D) pyrite.
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A) I think that you will mark brain list then thanks in advance
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