|
Crystallographic system | Triclinic |
Colours | Normally colourless or white, colourless in thin section. |
Lustre | Vitreous |
Hardness | 6-6.5 |
Refractive index | 1.51 |
Cleavage | 3: 1 perfect, 1 good, 1 poor |
Twinning | Multiple lamellar and Carlsbad twins[?] |
Pleochroism | Yellow to dark green to transparent to opaque |
wikipedia.org dumped 2003-03-17 with terodump