Constituent
Name
Pyroxene
IMA name
Pyroxene group
Class
silicate mineral
Compound type
inosilicate
Relevance
main - major
Arrangement
in multi-phases
Formula
AB.[(Si,Al)O3]2      where A=Ca,Na,Fe2+ and/or Mg and sometimes Zn,Mn2+,Li    and B=Al,Fe3+,Mg,Mn3+,Cr,Sc,Ti,V3+ and/or Fe2+
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 Isotope mole fraction 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
Fe2+ Iron(II) cation element 0 - 2 constituent element main
Fe3+ Iron(III) cation element 0 - 1 constituent element main
Mn2+ Manganese(II) cation element 0 - 1 constituent element main
Mn3+ 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
Cr3+ Chromium(III) cation element 0 - 1 constituent element main
Ti Titanium element 0 - 0.5 constituent element main
V3+ 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 Na2O MgO FeO Fe2O3 MnO Mn2O3 Al2O3 ZnO Li2O Cr2O3 TiO2 V2O3 Sc2O3 SiO2
Mass fraction (%)

Strunz

Class
silicates (09)
Division
inosilicate (09.D)
Family
with 2-periodic single chains, Si2O6; pyroxene family (09.DA)

Dana

Major class
silicates (VIII)
Class
inosilicate single-width unbranched chains, w=1 (65)
Type
with chains P=2 (65.01)
Group
N/A (N/A)
Phase type
crystalline
Crystal system
various
Crystal class
various
Crystal class symbol
various
Crystal spacegroup
various
Molar mass
186.09 - 248.09 g/mol
Density
3.1-4.07 g/cm3
Refringence type
biaxial
Refringence sign
positive or negative
Color
various
Diaphaneity
various
Luster
various