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Moh's Scale of Hardness

HardnessMineral
1Talc
2Gypsum
3Calcite
4Fluorite
5Apatite
6Orthoclase
7Quartz
8Topaz
9Corundum
10Diamond
To identify minerals in the field even if you don't have a complete set of the minerals of hardness on hand (which most people won't), use the scratch-test to get a rough guess of hardness. All you need are these common materials:
HardnessMaterial
2.2Your Fingernail
3.2Copper Penny
5.0Steel Nail
5.5Glass
7.0Streak Plate

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