Mineral | Dumortierite |
---|---|
Formula | Al6.5-7(BO3)(SiO4)3(O,OH)3 |
Crystal Form | Orthorhombic/Dipyramidal [2/m 2/m 2/m] |
Cleavage | [100] Good, [110] Indistinct |
Color | Blue, Brown, Violet, Greenish blue, Pink |
Density | 3.3 – 3.4 g/cm3 |
Diaphaneity | Transparent to Translucent |
Fracture | Fibrous |
Hardness | 8.5 |
Lustre | Vitreous |
Streak | White |
Dana 8 Class | 54.1.2.1 |
Strunz Class | VIII/B.31-20 |
Mindat | mindat.org |
WebMineral | WebMineral |
ID | 106 |