Augite
$(Ca,Na)(Mg,Fe,Ti,Al)(Si,Al)_2O_6$
Family
inosilicates
Crystal system
monoclinic
Color
black, dark green, brown
Streak color
greenish gray
Cleavage
2 distinct cleavages to 87
o
Hardness
3,5 to 45 to 6
Density
3,2 to 3,4
Explanations: →
Here
List of minerals: →
Here
