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Minerals
26 common minerals with hardness, sg, chemical formula
24
Geology
Undergraduate 1
02/15/2012

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Term
Augite (Pyroxene)
Definition
Ca(Mg,Fe,Al)(Al,Si)2O6
Silicate
H: 5-6
SG: 3.2-3.5
Monoclinic
Term
Barite
Definition
BaSO4
Sulfate
H: 2.5-3.5
SG: 4.5
Orthrhombic
Term
Biotite (Mica)
Definition
K(Mg,Fe)3AlSi3O10(OH)2
Silicate
H: 2.5-3
SG: 2.7-3.1
Monoclinic
Term
Calcite
Definition
CaCO3
Carbonate
H: 2.5-3
SG: 2.7
Hexagonal-Rhombohedral
Term
Corundum
Definition
AlO3
Oxide
H: 9
SG: 3.9-4.1
Hexagonal
Term
Dolomite
Definition
CaMg(CO3)2
Carbonate
H: 3.5-4
SG: 2.8-2.9
Hexagonal-Rhombohedral
Term
Fluroite
Definition
CaF2
Halide
H: 4
SG: 3-3.3
Isometric
Term
Galena
Definition
PbS
Sulfide
H: 2.5
SG: 7.4-7.6
Isometric
Term
Gypsum
Definition
CaSO4*2H2O
Sulfate
H: 2
SG: 2.3
Monoclinic
Term
Halite
Definition
NaCl
Halide
H: 2.5
SG: 2.1-2.6
Isometric
Term
Hematite
Definition
Fe2O3
Oxide
H: 5.5-6.5
SG: 4.9-5.3
Hexagonal-Rhombohedral
Term
Hornblende (Amphibole)
Definition
Ca2Na(MG,Fe)4(Al,Fe,Ti)3Si6O22(O,OH)2
Silicate
H: 5-6
SG: 3-3.3
Monoclinic
Term
Kaolinite
Definition
Al2Si2O5(OH)4
Silicate
H: 1-2.5
SG: 2.6
Monoclinic
Term
Limonite
Definition
FeO(OH)*nH2O
Oxide
H: 5-5.5
SG: 3.6-4
Not crystallized
Term
Magnetite
Definition
Fe3O4
Oxide
H: 3.5-4
SG: 3.9-4
Monoclinic
Term
Malachite / Azurite
Definition
Cu2CO3(OH)2
Carbonate
H: 3.5-4
SG: 3.9-4
Monoclinic
Term
Muscovite (Mica)
Definition
KAl3Si3O10(OH)2
Silicate
H: 2.5-3
SG: 2.7-3
Monoclinic
Term
Olivine
Definition
(MG,Fe)SiO4
Silicate
H: 6.5-7
SG: 3.3-3.4
Orthrhombic
Term
Orthoclase; Potassium Feldspar; K Spar
Definition
KAlSi2O8
Silicate
H: 6
SG: 2.6
Monoclinic
Term
Plagioclase (Feldspar)
Definition
NaAlSi3O8-CaAl2Si2O8
Silicate
H: 6-6.5
SG: 2.6-2.8
Triclinic
Term
Pyrite
Definition
FeS2
Sulfide
H: 6-6.5
SG: 5
Isometric
Term
Quartz
Definition
SiO2
Silicate
H: 7
SG: 2.7
Hexagonal
Term
Talc
Definition
Mg3Si4O10(OH)2
Silicate
H: 1-1.5
SG: 2.7-2.8
Monoclinic
Term
Tourmaline
Definition
Na(MG,Fe,Li,Al,MN)3Al6(BO3)3(Si6O18)(Oh,F)4
Silicate
H: 7-7.5
SG: 3-3.2
Hexagonal
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