Minerals - Specific Gravities

Specific gravity of some common minerals

Mineral Formula Specific Gravity
Biotite complex 2.8 - 3.2
Calcite CaCO3 2.71
Dolomite CaMg(CO3) 2 2.85
Gypsum CaSO4.2H2O 2.3
Quartz SiO2 2.65
K Feldspar KAlSi3O8 2.54 - 2.57
Na Feldspar NaAlSi2O8 2.62 - 2.76
Kaolinite Al2Si2O5(OH)4 2.61 - 2.66
Muscovite varies 2.76 - 3.0
Hematite Fe2O3 5.2 - 5.3
Serpentine Mg3Si2O5(OH)4 2.5 - 2.6
Illite complex 2.6 - 2.86
Montmorillonite complex 2.74 - 2.78

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