Minerais

Gypsum

CaSO4 · 2H2O

Monoclinic H: 1.5-2.0

Apatite

Ca5(PO4)3(F,Cl,OH)

Hexagonal H: 5.0

Olivine

(Mg,Fe)2SiO4

Orthorhombic H: 6.5-7.0

Garnet (Almandine)

Fe3Al2(SiO4)3

Cubic (Isometric) H: 6.5-7.5

Topaz

Al2SiO4(F,OH)2

Orthorhombic H: 8.0

Tourmaline

Complex borosilicate

Trigonal H: 7.0-7.5

Beryl (Emerald)

Be3Al2(SiO3)6

Hexagonal H: 7.5-8.0

Corundum

Al2O3

Trigonal H: 9.0

Talc

Mg3Si4O10(OH)2

Monoclinic H: 1.0

Halite

NaCl

Cubic (Isometric) H: 2.0-2.5

Muscovite

KAl2(AlSi3O10)(OH)2

Monoclinic H: 2.0-2.5

Biotite

K(Mg,Fe)3(AlSi3O10)(OH)2

Monoclinic H: 2.5-3.0

Malachite

Cu2(CO3)(OH)2

Monoclinic H: 3.5-4.0

Azurite

Cu3(CO3)2(OH)2

Monoclinic H: 3.5-4.0

Sulfur

S

Orthorhombic H: 1.5-2.5

Gold

Au

Cubic (Isometric) H: 2.5-3.0

Silver

Ag

Cubic (Isometric) H: 2.5-3.0

Copper

Cu

Cubic (Isometric) H: 2.5-3.0

Sphalerite

ZnS

Cubic (Isometric) H: 3.5-4.0

Chalcopyrite

CuFeS2

Tetragonal H: 3.5-4.0

Barite

BaSO4

Orthorhombic H: 3.0-3.5

Dolomite

CaMg(CO3)2

Trigonal H: 3.5-4.0

Aragonite

CaCO3

Orthorhombic H: 3.5-4.0

Spinel

MgAl2O4

Cubic (Isometric) H: 7.5-8.0

Cassiterite

SnO2

Tetragonal H: 6.0-7.0

Wolframite

(Fe,Mn)WO4

Monoclinic H: 4.0-4.5

Kyanite

Al2SiO5

Triclinic H: 4.5-7.0

Staurolite

Fe2Al9Si4O23(OH)

Monoclinic H: 7.0-7.5

Epidote

Ca2(Al,Fe)3(SiO4)(Si2O7)O(OH)

Monoclinic H: 6.0-7.0

Wollastonite

CaSiO3

Triclinic H: 4.5-5.0

Rutile

TiO2

Tetragonal H: 6.0-6.5

Siderite

FeCO3

Trigonal H: 3.5-4.5

Chrysocolla

(Cu,Al)2H2Si2O5(OH)4 · nH2O

Orthorhombic H: 2.0-4.0

Celestine

SrSO4

Orthorhombic H: 3.0-3.5

Cinnabar

HgS

Trigonal H: 2.0-2.5

Rhodochrosite

MnCO3

Trigonal H: 3.5-4.0

Labradorite

(Ca,Na)(Al,Si)4O8

Triclinic H: 6.0-6.5

Amazonite

KAlSi3O8

Triclinic H: 6.0-6.5

Sodalite

Na4Al3Si3O12Cl

Cubic (Isometric) H: 5.5-6.0

Diamond

C

Cubic (Isometric) H: 10.0

Fluorite

CaF2

Cubic (Isometric) H: 4.0

Hematite

Fe2O3

Trigonal H: 5.0-6.5

Zircon

ZrSiO4

Tetragonal H: 6.5-7.5

Quartz

SiO2

Trigonal H: 7.0

Feldspar (Orthoclase)

KAlSi3O8

Monoclinic H: 6.0-6.5

Calcite

CaCO3

Trigonal H: 3.0

Pyrite

FeS2

Cubic (Isometric) H: 6.0-6.5

Turquoise

CuAl6(PO4)4(OH)8 · 4H2O

Triclinic H: 5.0-6.0