Hornblende
$(Ca,Na)_{2-3}(Mg,Fe,Al)_55Si_6(Si,Al)_2O_{22}(OH)_2$
Family
inosilicates
Crystal system
monoclinic
Color
green, black
Streak color
white to grey, greenish
Cleavage
2 perfect cleavages to 124
o
Hardness
5 to 6
Density
3,0 to 3,4
Explanations: →
Here
List of minerals: →
Here
