|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | uraninite | 5.50 | none | conchoidal | opaque | none | 7.50 | dull | black | black | faceted | oxides | Physical properties are variable as uranium decays to lead within crystal. Radioactive. |
|