|
Crystallographic system | Orthorhombic |
Colours | White, brown and green |
Lustre | Silky if in fibrous form, else vitreous |
Hardness | 7.5 |
Refractive index | 1.641-1.648 |
Cleavage | 1 |
Twinning | n/a |
Pleochroism | Colourless to pale brown to yellow |
Type locality | Vltava, Susice[?], Czech Republic. |
wikipedia.org dumped 2003-03-17 with terodump