|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | neptunite | 5.00 | parallel | Splintery | opaque | none | 3.23 | glassy | black | red | prismatic | silicates | Black to brown crystal. Dark red streak. Associated with benitoite. |
|