Mineral or group

(abbreviation)

Abundance

(%)

Formula

Amphiboles (Amp)

0 - 2

Actinolite

$C{a}_2{\left(Mg,Fe\right)}_{5}S{i}_8{O}_{22}{\left(OH\right)}_2$

Cummingtonite

${\left(Mg,Fe\right)}_{7}S{i}_8{O}_{22}{\left(OH\right)}_2$

Grunerite

$F{e}_{7}S{i}_8{O}_{22}{\left(OH\right)}_2$

Hornblende

${\left(Ca,Na,K\right)}_2{\left(Mg,Fe,Al\right)}_{5}S{i}_8{O}_{22}{\left(OH\right)}_2$

Apatite (Apt)

0 - 2

$C{a}_5{\left(P{O}_4\right)}_3\left(OH,F\right)$

Carbonates (Carb)

0 - 2

Ankerite

$Ca\left(Fe,Mg,Mn\right){\left(C{O}_3\right)}_2$

Calcite

CaCO₃

Dolomite

CaMg(CO₃)₂

Hematite (Hem)

30 - 50

Fe₂O₃

Hydrated iron oxides (Goe)

0 - 3

Goethite

FeO∙H₂O

Limonite

FeO(OH)∙nH₂O

Magnetite (Mag)

2 - 8

Fe₃O₄

Mica (Mic)

0 - 2

Biotite

$K{\left(Mg,Fe,Ti\right)}_{3}AlS{i}_3{O}_{10}{\left(OH,F\right)}_2$

Manganese oxides (MnO₂)

0 - 1

Pyrolusite

MnO₂

Plagioclases (Plg)

0 - 2

N/A

Pyrite (Pyr)

0 - 1

FeS₂

Quartz (Qtz)

40 - 60

SiO₂

Titaniferous minerals (TiMin)

0 - 1

Ilmenite

FeO∙TiO₂