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60 A.A. Gorbushina and W.E. Krumbein<br />

Table 1. The main rock forming minerals<br />

Igneous/magmatic rocks Sedimentary rocks Metamorphic rocks<br />

Quartz Quartz Quartz<br />

Orthoclase Clay minerals Biotite<br />

Plagioclase Iron oxide (rust) Muscovite<br />

Biotite Orthoclase Amphibole<br />

Muscovite Biotite Garnet<br />

Amphibole Muscovite Talc<br />

Pyroxene Calcite Chlorite<br />

Olivine Dolomite Staurolite<br />

Halite Orthoclase<br />

Gypsum Plagioclase<br />

The sequence of minerals reflects the abundance in the individual rock class<br />

Table 2. Kind and composition of rock forming minerals<br />

Type Mineral Composition<br />

Silicates<br />

Quartz Quartz SiO2<br />

Feldspars Orthoclase (K, Na) AlSi3O8<br />

Anorthite CaAl2Si2O8<br />

Albite (Na, K) AlSi3O8<br />

Feldspatoids Nepheline NaAlSiO4<br />

Leucite KAlSi2O6<br />

Micas Muscovite KAl2(OH)2AlSi3O10<br />

Biotite K(Mg, Fe)3(OH)2AlSi3O10<br />

Amphiboles Amphibole (Ca, Na)2(Mg, Fe, Al)5(OHSi4O11)<br />

Pyroxenes Orthopyroxene (Mg, Fe)2Si2O6<br />

Clinopyroxene Ca(Mg,Fe)Si2O6–Na(Al,Fe)Si2O6<br />

Olivines Forsterite Mg2SiO4<br />

Fayalite Fe2SiO4<br />

Clays Kaolinite Al4[(OH)8SiO4O10]<br />

Montmorillonite Al2O3 × 4SiO2 × H2O + nH2O<br />

Illite (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2(H2O)]<br />

Carbonates Calcite CaCO3<br />

Aragonite CaCO3<br />

Dolomite (Ca, Mg) CO3<br />

Sulphates Gypsum CaSO4 × 2H2O<br />

Anhydrite CaSO4<br />

Sulphides Pyrite/Marcasite FeS2<br />

Troilite FeS<br />

Galenite PbS<br />

Oxides Goethite FeOOH<br />

Hematite Fe2O3<br />

Phosphates Apatite Ca5[(F,Cl,OH)/(PO4)3]

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