Constituent
Name
Clinopyroxenes
IMA name
Clinopyroxenes subgroup
Class
silicate mineral
Compound type
inosilicate
Constituent abundance in material
Relevance
impurity
Arrangement
complex intimate mix
Mass fraction
0.044 $\pm$ 0.04
Abundance comments
Mostly Augite - Mass fraction uncertain (0.044 for < 2µm size - Vogt 2002)
Chemical composition
Formula
$AB.[SiO_3]_2$ with $A = Na, Ca, Fe^{2+}, Mn^{2+}$ and/or $Mg$, and $B = Fe^{2+}, Mn^{2+}, Mg, Al, Zn, Ti, Cr, V$ and/or $Sc$)
Chemical formula
(Na,Ca,Fe2+,Mn2+,Mg)(Fe2+,Mn2+,Mg,Al,Zn,Ti,Cr,V,Sc)Si2O6
Elemental formula
(Na)0-1 (Ca)0-1 (Fe2+)0-1 (Mn2+)0-0.5 (Mg)0-1 (Al)0-1 (Zn)0-1 (Ti)0-1 (Cr)0-1 (V)0-1 (Sc)0-1 Si2 O6
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Na$ Sodium element 0 - 1 constituent element main
$Ca$ Calcium element 0 - 1 constituent element main
$Fe^{2+}$ Iron(II) cation element 0 - 1 constituent element main
$Mn^{2+}$ Manganese(II) cation element 0 - 0.5 constituent element main
$Mg$ Magnesium element 0 - 1 constituent element main
$Al$ Aluminium element 0 - 1 constituent element main
$Zn$ Zinc element 0 - 1 constituent element main
$Ti$ Titanium element 0 - 1 constituent element main
$Cr$ Chromium element 0 - 1 constituent element main
$V$ Vanadium element 0 - 1 constituent element main
$Sc$ Scandium element 0 - 1 constituent element main
$Si$ Silicon element 2 constituent element main
$O$ Oxygen element 6 constituent element main
Composition comments
Common impurities: $K, Co, Ni
Oxides
Formula $Na_{2}O$ $CaO$ $FeO$ $MnO$ $MgO$ $Fe_{2}O_{3}$ $Al_{2}O_{3}$ $ZnO$ $TiO_{2}$ $Cr_{2}O_{3}$ $V_{2}O_{5}$ $Sc_{2}O_{3}$ $SiO_{2}$
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
Refringence type
various
Refringence sign
positive or negative
Color
various
Diaphaneity
transparent to opaque
Luster
various