Number 10 on the Mohs Scale. This crystal of carbon is the hardest mineral
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Diamond
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Number 9 on the Mohs Scale. This crystal has the formula Al 03
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Corundum
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Number 8 on the Mohs Scale. This crystal has the formula Al2SiO4(OHF)2
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Topaz
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Number 7 on the Mohs Scale. This crystal has the formula SiO2
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Quartz
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Number 6 on the Mohs Scale. This mineral has the formula KAlSi3O8
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Orthoclase Feldspar
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Number 5 on the Mohs Scale. This mineral has the formula Ca5(PO4)3(OHClF)
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Apatite
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Number 4 on the Mohs Scale. This mineral has the formula CaF2
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Flourite
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Number 3 on the Mohs Scale. This mineral has the formula CaCO3
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Calcite
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Number 2 on the Mohs Scale. This mineral has the formula CaSO4 2H2O
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Gypsum
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Number 1 on the Mohs Scale. This mineral has the formula Mg3Si4O10(OH)2
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Talc
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