Mineral | Riebeckite |
---|---|
Formula | Na2[(Fe2+,Mg)3Fe3+2]Si8O22(OH)2 |
Crystal Form | Monoclinic/Prismatic [2/m] |
Cleavage | Perfect on {110} |
Color | Black, dark blue, dark blue to yellow-green |
Density | 3.3 – 3.4 g/cm3 |
Diaphaneity | Translucent, Opaque |
Fracture | Conchoidal - Uneven, Splintery |
Hardness | 5.0 - 6.0 |
Lustre | Vitreous - Silky |
Streak | Pale gray to bluish-grey |
Dana 8 Class | 66.01.03c.05 |
Strunz Class | 8/F.08-50 |
Mindat | mindat.org |
WebMineral | WebMineral |
ID | 209 |