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Graphite
1-2
Galena
2.5
Magnetite
5.5-6.5
Pyrite
6.5
Hematite
5.5-6.5 or 1
Talc
1
Sulfur
2
Selenite gypsum
2
Muscovite mica
2-2.5
Halite
2.5
Biotite mica
2.5-3
Calcite
3
Dolomite
3.5
Fluorite
4
Pyroxene (commonly augite)
5-6
Amphibole (commonly hornblende)
5.5
Potassium feldspar (commonly orthoclase)
6
Plagioclase feldspar
6
Olivine
6.5
Quartz
7
Garnet
6.5-7.5