| Mineral | Holmquistite |
|---|---|
| Formula | Li[(Mg,Fe2+)3Al2]Si8O22(OH)2 |
| Crystal Form | Orthorhombic/Dipyramidal [2/m 2/m 2/m] |
| Cleavage | Perfect on {210}, intersecting at ~54 and ~126 deg. |
| Color | Black, dark violet to light sky-blue; pale yellow to violet in thin section |
| Density | 3.0 – 3.1 g/cm3 |
| Diaphaneity | Transparent to translucent |
| Hardness | 5.0 - 6.0 |
| Lustre | Vitreous |
| Streak | White, with sky-blue tinge |
| Dana 8 Class | 66.1.2.9 |
| Strunz Class | 8/F.12-20 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 253 |