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mohs hardness scale

Mohs hardness scale and comparison to common items. Image by the National Park Service. Public Domain.

The Mohs Hardness Scale

10 Diamond
9 Corundum
8 Topaz
7 Quartz
6 Feldspar
5 Apatite
4 Fluorite
3 Calcite
2 Gypsum
1 Talc

Select Gems Ordered By Mohs Hardness

Name Hardness Name Hardness
Diamond 10 Hypersthene 5 – 6
Synth. Moissanit 9? Ilmenite 5 – 6
Ruby 9 Lapis Lazuli 5 – 6
Sapphire 9 Lazulite 5 – 6
Alexandrite 8? Nepheline 5 – 6
Chrysoberyll 8? Neptunite 5 – 6
Holtite 8? Pargasite 5 – 6
YAG 8? Richterite 5 – 6
Zirconia 8? Samarskite 5 – 6
Rhodizite 8 – 8? Stibiotantalite 5 – 6
Taafeite 8 – 8? Tremolite 5 – 6
Spinel 8 Turquoise 5 – 6
Topaz 8 Analcime 5 – 5?
Aquamarine 7? – 8 Datolite 5 – 5?
Red Beryl 7? – 8 Durangite 5 – 5?
Precious Beryl 7? – 8 Eudialyte 5 – 5?
Gahnite 7? – 8 Goethite 5 – 5?
Galaxite 7? – 8 Herderite 5 – 5?
Painite 7? – 8 Hydroxylherderite 5 – 5?
Phenakite 7? – 8 Meliphanite 5 – 5?
Emerald 7? – 8 Mesolite 5 – 5?
Andalusite 7? Microlite 5 – 5?
Euclase 7? Monazite 5 – 5?
Hambergite 7? Natrolite 5 – 5?
Sapphirine 7? Nickeline 5 – 5?
Dumortierite 7 – 8? Papagoite 5 – 5?
Almandine 7 – 7? Psilomelane 5 – 5?
Boracite 7 – 7? Scolecite 5 – 5?
Cordierite 7 – 7? Sellaite 5 – 5?
Danburite 7 – 7? Thomsonite 5 – 5?
Grandidierite 7 – 7? Titanite 5 – 5?
Pyrope 7 – 7? Wolframite 5 – 5?
Schorlomite 7 – 7? Yttrotantalite 5 – 5?
Sekaninaite 7 – 7? Apatite 5
Simpsonite 7 – 7? Bismutotantalite 5
Spessartine 7 – 7? Childrenite 5
Staurolite 7 – 7? Chlorapatite 5
Turmaline 7 – 7? Dioptase 5
Uvarovite 7 – 7? Eosphorite 5
Amethyst 7 Flourapatite 5
Aventurine 7 Hemimorphite 5
Rock Crystal 7 Hydroxylapatite 5
Chambersite 7 Mangan-Apatite 5
Chromdravite 7 Odontolite 5
Citrine 7 Rinkite 5
Forsterite 7 Schlossmacherite 5
Povondraite 7 Smithsonite 5
Quartz 7 Spurrite 5
Smoky Quartz 7 Strass 5
Zunyite 7 Vayrynenite 5
Garnet 6? – 7? Ekanite 4? – 6?
Jeremejevite 6? – 7? Apophyllite 4? – 5
Sillimanite 6? – 7? Augelite 4? – 5
Zircon 6? – 7? Charoite 4? – 5
Axinite 6? – 7 Gaspéite 4? – 5
Chalcedony 6? – 7 Hodgkinsonite 4? – 5
Chrysoprase 6? – 7 Legrandite 4? – 5
Diaspore 6? – 7 Pectolite 4? – 5
Ferro-Axinite 6? – 7 Scheelite 4? – 5
Gadolinite 6? – 7 Wardite 4? – 5
Grossular 6? – 7 Wollastonite 4? – 5
Hiddenite 6? – 7 Bayldonite 4?
Jadeite 6? – 7 Colemanite 4?
Jasper 6? – 7 Parisite 4?
Kornerupine 6? – 7 Prosopite 4?
Kunzite 6? – 7 Yugawaralite 4?
Mangan-Axinite 6? – 7 Kyanite 4 – 7
Peridot 6? – 7 Sérandite 4 – 5?
Pollucite 6? – 7 Chabazite 4 – 5
Serendibite 6? – 7 Friedelite 4 – 5
Sinhalite 6? – 7 Lithiophilite 4 – 5
Spodumene 6? – 7 Mordenite 4 – 5
Tanzanite 6? – 7 Triphylite 4 – 5
Thorianite 6? – 7 Variscite 4 – 5
Tinzenite 6? – 7 Zincite 4 – 5
GGG 6? Carletonite 4 – 4?
Magnesio-Axinite 6? Hübnerite 4 – 4?
Nambulite 6? Purpurite 4 – 4?
Vesuvianite 6? Algodonite 4
Cassiterite 6 – 7 Ammonite 4
Clinozoisite 6 – 7 Barytocalcite 4
Epidote 6 – 7 Flourite 4
Hancockite 6 – 7 Leucophanite 4
Pyrolusite 6 – 7 Libethenite 4
Sogdianite 6 – 7 Rhodochrosite 4
Amazonite 6 – 6? Magnesite 3? – 4?
Andesine 6 – 6? Siderite 3? – 4?
Anorthoclase 6 – 6? Ankerite 3? – 4
Benitoite 6 – 6? Aragonite 3? – 4
Bixbyite 6 – 6? Azurite 3? – 4
Bytownite 6 – 6? Chalcopyrite 3? – 4
Chondroite 6 – 6? Creedite 3? – 4
Helvite 6 – 6? Cuprite 3? – 4
Hyalophane 6 – 6? Dickinsonite 3? – 4
Labradorite 6 – 6? Dolomite 3? – 4
Marcasite 6 – 6? Euchroite 3? – 4
Microcline 6 – 6? Langbeinite 3? – 4
Nephrite 6 – 6? Malachite 3? – 4
Norbergite 6 – 6? Mimetite 3? – 4
Oligoclase 6 – 6? Pentlandite 3? – 4
Petalite 6 – 6? Powellite 3? – 4
Prehnite 6 – 6? Scorodite 3? – 4
Pyrite 6 – 6? Shungite 3? – 4
Rutile 6 – 6? Shattuckite 3? – 4
Sanidine 6 – 6? Sphalerite 3? – 4
Smaragdite 6 – 6? Wavellite 3? – 4
Sugilite 6 – 6? Wurtzite 3? – 4
Tantalite 6 – 6? Adamite 3?
Xonotlite 6 – 6? Anhydrite 3?
Zoisite 6 – 6? Chiolite 3?
Aegirine 6 Huréaulite 3?
Amblygonite 6 Strontianite 3?
Clinohumite 6 Thaumasite 3?
Humite 6 Weloganite 3?
Hurlbutite 6 Cacoxenite 3 -4
Lawsonite 6 Coral 3 -4
Pumpellyite 6 Ludlamite 3 -4
Tephroite 6 Anglesite 3 – 3?
Vlasovite 6 Baryte 3 – 3?
Zektzerite 6 Boleite 3 – 3?
Hematite 5? – 6? Cerussite 3 – 3?
Hedenbergite 5? – 6? Celestine 3 – 3?
Magnetite 5? – 6? Descloizite 3 – 3?
Manganotantalite 5? – 6? Greenockite 3 – 3?
Opal 5? – 6? Howlite 3 – 3?
Rhodonite 5? – 6? Millerite 3 – 3?
Actinolite 5? – 6 Phosphophyllite 3 – 3?
Allanite 5? – 6 Witherite 3 – 3?
Anatase 5? – 6 Bornite 3
Beryllonite 5? – 6 Calcite 3
Brookite 5? – 6 Kurnakovite 3
Bustamite 5? – 6 Shortite 3
Canasite 5? – 6 Wulfenite 3
Cobaltite 5? – 6 Serpentine ?2? –? 5?
Euxenite 5? – 6 Pearl ?2? –? 4?
Fabulite 5? – 6 Jet ?2? –? 4
Fergusonite 5? – 6 Chalcocite ?2? –? 3
Haüyne 5? – 6 Crocoite ?2? –? 3
Leucite 5? – 6 Gaylussite ?2? –? 3
Marialite 5? – 6 Gold ?2? –? 3
Meionite 5? – 6 Inderite ?2? –? 3
Milarite 5? – 6 Lepidolite ?2? –? 3
Montebrasite 5? – 6 Pyrargyrite ?2? –? 3
Natromontebrasite 5? – 6 Silver ?2? –? 3
Periclase 5? – 6 Stolzite ?2? –? 3
Pyroxmangite 5? – 6 Vanadinite ?2? –? 3
Sarcolite 5? – 6 Whewellite ?2? –? 3
Scorzalite 5? – 6 Brucite ?2?
Scapolite 5? – 6 Cryolite ?2?
Sodalite 5? – 6 Linarite ?2?
Tugtupite 5? – 6 Lizardite ?2?
Brazilianite 5? Proustite ?2?
Breithauptite 5? Sturmanite ?2?
Chromite 5? Chrysocolla 2 – 4
Enstatite 5? Clinochrysotile 2 -3
Linobate 5? Fuchsite 2 -3
Magnesiochromite 5? Muscovite 2 -3
Moldavite 5? Phosgenite 2 -3
Willemite 5? Shomiokite 2 -3
Aeschynite 5 – 6 Amber 2 –? 2?
Bronzite 5 – 6 Cinnabar 2 –? 2?
Cancrinite 5 – 6 Ettringite 2 –? 2?
Catapleiite 5 – 6 K?mmererite 2 –? 2?
Ceruléite 5 – 6 Mellite 2 –? 2?
Clinoenstatite 5 – 6 Senarmontite 2 –? 2?
Davidite 5 – 6 Ulexite 2 –? 2?
Diopside 5 – 6 Villiaumite 2 –? 2?
Ferrosilite 5 – 6 Gypsum 2
Hornblende 5 – 6 Stichtite 1?? –? 2?
Sulphur 1?? –? 2?
Covellite 1?? –? 2
Melonite 1?? –? 2
Realgar 1?? –? 2
Vivianite 1?? –? 2
Palygorskite 1 – 2
Pyrophyllite 1 – 2
Talc 1

Source:?Gemstones of the World, 3rd Edition, Walter Schumann.

Mohs hardness scale - Friedrich Mohs

“Friedrich Mohs” (1773-1839), creator of the Mohs hardness scale. Lithograph by Josef Kriehuber, 1832. The Peter Geymayer Collection. Public Domain.