|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | corundum | 9.00 | none | conchoidal | Transparent | none | 3.90 | glassy | brown | white | faceted | oxides | Very hard. Distinct crystals are barrel shaped. |
|