|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | ferberite-heubnerite | 5.00 | basal | Uneven | Translucent | none | 7.10 | submetallic | black | brown | tabular | tungstates | Semi-metallic to metallic lusterDark brown to black with reddish brown streak. Solid solution series between ferberite and heubnerite. |
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