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MOH’S HARDNESS SCALE WITH EXAMPLES: TALC, GRAPHITE – Can be scratched with a fingernail or any stone with a hardness of 2 or more. GYPSUM – Can be scratched with a fingernail or any stone with a hardness of 3 or more. CALCITE – Can be scratched with a knife or any stone with a hardness of 4 or more. MALACHITE, PLATINUM – Can be scratched with a knife or any stone with a hardness of 5 or more. And will scratch any stone rated 3 or lower. APETITE, DIOPTASE – Can be scratched with a knife or any stone with a hardness of 6 or more. And will scratch any stone rated 4 or lower. AMAZONITE, HEMATITE – Can be scratched with a knife or any stone with a hardness of 7 or more. And will scratch any stone rated 5 or lower. QUARTZ, TOURMALINE – Can be scratched by any stone with a hardness of 8 or more. Will scratch glass and any stone rated 6 or lower. TOPAZ, SPINEL – Can be scratched by any stone with a hardness of 9 or 10. Will scratch glass and any stone rated 7 or lower. CORUNDUM (Sapphire or Ruby) – Can be scratched by Diamond. Will scratch glass and any stone rated 8 or lower. DIAMOND – Will scratch glass and all other stones. |