| Sample # |
7 |
| Mineral
Name |
BIOTITE MICA |
| Chemical Composition |
K(Mg,Fe)3AlSi3O10(OH,F)2 |
| Luster |
Vitreous |
| Color(s) |
Black to
brownish black |
| Streak Color |
White to
grey |
| Specifc Gravity |
2.8-3.2 |
| Habit |
Micaceous.
tabular |
| Cleavage/Fracture |
Basalt, perfect |
| Hardness |
2.5-3 |
| Diagnostic Feature(s) | Perfect basal clavage, color, luster |
