Mineral | Gadolinite-(Y) |
---|---|
Formula | Y2Fe2+Be2Si2O10 |
Crystal Form | Monoclinic/Prismatic [2/m] |
Color | Black, Greenish-black, Brown, Grass-green to Olive-green in thin fragments |
Density | 4.4 – 4.8 g/cm3 |
Diaphaneity | Opaque, nearly transparent in thin fragments |
Fracture | Splintery, Conchoidal |
Hardness | 6.5 - 7.0 |
Lustre | Vitreous, Greasy |
Streak | Greenish gray |
Type Loc. | Ytterby, Resarö, Vaxholm, Uppland, Sweden |
Dana 8 Class | 54.2.1b.3 |
Strunz Class | 8/B.29-50 |
Mindat | mindat.org |
WebMineral | WebMineral |
ID | 375 |