Pyroxene group

Mineral phase

Formula: $AB.[(Si,Al)O_3]_2 \ \ \ \ \ $ where $A = Ca, Na, Fe^{2+}$ and/or $Mg$ and sometimes $Zn, Mn^{2+}, Li \ \ \ $ and $B = Al, Fe^{3+}, Mg, Mn^{3+}, Cr, Sc, Ti, V^{3+}$ and/or $Fe^{2+}$
Chemical formula: (Ca,Na,Fe2+,Mg,Zn,Mn2+,Li)(Al,Fe3+,Mg,Mn3+,Cr,Ti,Sc,V3+,Fe2+)(Si,Al)2O6
Elemental formula: (Ca)0-1 (Na)0-1 (Mg)0-2 (Fe2+)0-2 (Fe3+)0-1 (Mn2+)0-1 (Mn3+)0-1 (Al)0-1 (Zn)0-1 (Li)0-1 (Cr3+)0-1 (Ti)0-0.5 (V3+)0-1 (Sc)0-1 (Si)1-2 O6
Isotope mixture type: terrestrial abundance

Formula	Name	Family	Number min-max	State	Relevance
$Ca$	Calcium	element	0 - 1	constituent element	main
$Na$	Sodium	element	0 - 1	constituent element	main
$Mg$	Magnesium	element	0 - 2	constituent element	main
$Fe^{2+}$	Iron(II) cation	element	0 - 2	constituent element	main
$Fe^{3+}$	Iron(III) cation	element	0 - 1	constituent element	main
$Mn^{2+}$	Manganese(II) cation	element	0 - 1	constituent element	main
$Mn^{3+}$	Manganese(III) cation	element	0 - 1	constituent element	main
$Al$	Aluminium	element	0 - 1	constituent element	main
$Zn$	Zinc	element	0 - 1	constituent element	main
$Li$	Lithium	element	0 - 1	constituent element	main
$Cr^{3+}$	Chromium(III) cation	element	0 - 1	constituent element	main
$Ti$	Titanium	element	0 - 0.5	constituent element	main
$V^{3+}$	Vanadium(III) cation	element	0 - 1	constituent element	main
$Sc$	Scandium	element	0 - 1	constituent element	main
$Si$	Silicon	element	1 - 2	constituent element	main
$O$	Oxygen	element	6	constituent element	main

Oxides

Formula	$CaO$	$Na_{2}O$	$MgO$	$FeO$	$Fe_{2}O_{3}$	$MnO$	$Mn_{2}O_{3}$	$Al_{2}O_{3}$	$ZnO$	$Li_{2}O$	$Cr_{2}O_{3}$	$TiO_{2}$	$V_{2}O_{3}$	$Sc_{2}O_{3}$	$SiO_{2}$
Mass fraction (%)

End-members

Crystallography

Links