|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | biotite (mica group) | 2.50 | basal | Uneven | Transparent | none | 2.80 | glassy | black | white | tabular | silicates | Color black, brown to dark green. |
|