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potassium feldspar
potassium feldspar
potassium feldspar
Apatite
Dolomite. I think.
soapstone
not diamond
apatite with a steel knife feldspar with window glass
Halite is hard. It can be scratched by a steel file and a knife with difficulty
Dolomite is a metal, a dolomite mountain is a mountain made of dolomite
Dolomite has a rhombohedral cleavage.
The fracture of dolomite is conchoidal