knife (H=5.5) but NOT by the 
penny (H=3). Therefore, the sample has a hardness of about 4. Using other property tests that you will learn in lab, you then determine that the mineral is calcite
For example, a sample can be scratched by the knife (H=5.5) but NOT by the penny (H=3). Therefore, the sample has a hardness of about 4. Using other property tests that you will learn in lab, you then determine that the mineral is calcite
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