Sillimanite [ Al2SiO5 ]
Material properties
| Formula | Al2SiO5 |
| Abbreviation | Sil |
| IMA Status | Grandfathered (pre-IMA), 1824 |
| Crystal symmetry | Orthorhombic, Point group mmm |
| Classifications | Al2SiO5 (group), Aluminium silicate (var. Al2SiO5), Sillimanite (subgroup) |
| Related materials | Andalusite, Kyanite |
| Search other databases | webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database |
| Tags | Aluminosilicate, Mineral |
Composition
| Element | Atoms |
|---|---|
| Si | 1 |
| Al | 2 |
| O | 5 |
| Total: | 8 |
Specimens of Sillimanite
| Name | Owner | Materials | Phase purity | Image |
|---|---|---|---|---|
| M2126 Sillimanite | CSIRO | Boehmite, Kaolinite, Sillimanite (78.7%) | 78.7 | |
| M2168 Andalusite | CSIRO | Andalusite, Grossular, Muscovite-2M1, Sillimanite (2.4%) | 2.4 |
