Number 23

Color--------------------Greenish black

Luster-------------------Nonmetallic, waxy

Streak------------------Light green

Hardness--------------5.0 - 6.0

Cleavage/--------------Cleavage, 2 good cleavages at
Fracture                    almost at 90 degrees

S.G.---------------------3.2 - 3.6

Special Properties---none

Formula----------------Ca(Mg,Fe,Al)(Al,Si)2O6

Mineral name---------Augite

Family------------------Silicates

Uses---------------------Very common rock forming mineral

Augite