Mohs scale of mineral hardness

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To determine the hardness of a mineral or a hone, we are using the scale of mineral hardness by Friedrich Mohs. It is based on "what scratches what".

Substance or Mineral Hardness
Diamond 10
Corundum (Al2O3) 9
Carborundum (SiC) 9
Ruby 9
Saphire 9
Chrysoberyll 8,5
Spinell 8
Topaz 8
Beryll 7,5 - 8
Emerald 7,5 - 8
Wolfram 7,5
Garnet 7- 7,5
Zircon 6,5 - 7,5
Amethyst 7
Quartz 7
Citrin 7
Tiger Eye 7
Agate 6,5 -7
Jadeit 6,5 - 7
Jaspis 6,5 - 7
Carneol 6,5 - 7
Moss-Agate 6,5 - 7
Onyx-Chalcedon 6,5 - 7
Labradorit 6 - 6,5
Moon stone 6 - 6,5
Pyrite 6 - 6,5
Titan 6
Haematite 5,5 - 6,5
Opal 5,5 - 6,5
Beryllonit 5,5 - 6
Glass 5 - 7
Lapislazuli 5 - 6
Obsidian 5 - 5,5
Turquoise 5 -6
Iron 4,5
Platinum 4,3
Rhodochrosit 4
Nickel 3,8
Malachite 3,5 - 4
Coral 3 - 4
Pearl 3 - 4
Calcit 3
Silver 2,7
Jet 2,5 - 3,5
Gold 2,5 - 3
Copper 2,5 - 3
Zinc 2,5
Seafoam 2 - 2,5
Amber 2 - 2,5
Ivory 2 - 3
Alabaster 2
Tin 1,8
Horn 1,5 - 2,5
Lead 1,2

More information about this scale can be found in Mohs scale of mineral hardness.