The mineral that should be hard sufficient to scratch calcite at the same time it should be hard enough to scratch amphibole is fluorite.
What is fluorite?
Fluorite refers to the mineral form of calcium fluoride, CaF₂. It should belong to the halide minerals. It should be crystallized in isometric cubic habit.
So based on this we can say that The mineral that should be hard sufficient to scratch calcite at the same time it should be hard enough to scratch amphibole is fluorite.
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