|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | boulangerite | 2.50 | perfect | Uneven | opaque | none | 5.80 | metallic | silver | black | acicular | sulfides | dull metallic luster |
|