(Ca,Na)(Mg,Fe,Al)(Si,Al)2O6Monoclinic
Augite
(Ca,Na)(Mg,Fe,Al)(Si,Al)2O6
SilicatesChemical Formula(Ca,Na)(Mg,Fe,Al)(Si,Al)2O6
Crystal SystemMonoclinic
Mohs Hardness6
Specific Gravity3.26
ColorBlack to dark green
LusterVitreous to dull
StreakGreenish gray
CleavageTwo directions
FractureUneven
Occurrence
Common pyroxene found in mafic igneous rocks like basalt and gabbro.