Tag: augite
Augite thin section
From Greek for luster, from the appearance of cleavage planes.
Formula: (Ca,Mg,Fe)2Si2O6
System: Monoclinic
Color: Brown-green, black, etc.
Lustre: Vitreous, Resinous, Dull
Hardness: 5½–6
Density: 3.19–3.56
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Relief: High...