Quartz can be discolored due to its

Light bounces off

The hardest mineral is

The streak can be tested by

Fracture is when

Hardness can be tested by

A rock is graphite is

I scratch a rock aganist quartz. Quartz scratches the rock. This means the hardness is

What is the best way to determine if the mineral sample is calcite or quartz?

Which mineral reflects nearly all the light off its surface?

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