Mineral/chemical composition


Mineral/chemical composition


Albite NaAlSi3O8

Sodium Plagioclase feldspar. Magmatic and pegmatitic rocks.

Magnesiohornblende Ca2[Mg4(Al, Fe3+)]Si7AlO22(OH)2

Igneous and metamorphic rocks.

Anorthite CaAl2Si2O8

Magmatic and metamorphic rocks.

Magnetite (lodestone)

mineral in igneous and metamorphic rocks.

Antigorite (MgFe2+)3Si2O5(OH)4

Common in regional and contact metamorphosed serpentinites.

Microcline KAlSi3O8,

Granitic pegmatites, hydrothermal and metamorphic rocks.

Augite―a pyroxene (Ca, Na)(Mg, Fe, Al, Ti)(Si, Al)2O6

Ferromagnesian silicate. Basic igneous and metamorphic rocks.

Montmorillonite NaCaAl2Si4O10(OH)2(H2O)10

Absorbing water and expanding.

Biotite―Black mica K(MgFe2+)3AlSi3O10(OH, F)2

Granitic rocks. Forms a series with phlogopite.

Muscovite KAl2(Si3Al)O10(OH,F)2

Granites and pegmatites.

Calcite CaCo3

Found in all kind of rocks.


It is the iron (III) rich member of the smectite group of clay minerals.

Chiavennite CaMnBe2Si5O13(OH)2×2(H2O)

Vitreous, massive, orange inter grown in white quartz matrix.

Offretite (K2,Ca,Mg)2×5Al5Si13O36×15(H2O)

Alteration of basalt with the addition of potash.



Alteration mineral. Metamorphic rock.

Pargasite NaCa2Mg3Fe2+Si6Al3O22(OH)2

A complex inosilicate mineral of the amphibole group.

Diopside CaMg(Si2O6)

Basic and ultrabasic igneous and metamorphic rocks.

Quartz (SiO2)

It is a component of almost every rock type.

Dolomite CaMg(CO3)2

Anhydrous carbonate mineral (sedimentary carbonate rock).



Cooling of a high temperature calc-silicate rock oxidizing onditions.

Goethite Fe3+O(OH)

Common in iron ore deposits. Concentrated in laterite soils.


A sodium-rich member of the amphibole group of silicate minerals.

Halite NaCl

Marine or continental Evaporite deposits.



An inadequately described mineral.

Hematite Fe2O3

Magmatic, sedimentary memetamorphic.


Differentiated alkalic massifs.



Found in massive crystal grown in with idocrase.

Zircon ZrSiO4

Zircon is a mineral (group of nesosilicates).