| Name: | Sillimanite Sil |
| IMA Chemistry: | Al2SiO5 |
| Chemistry Elements: | The mineral Sillimanite contains elements: Aluminum (Al) Silicon (Si) Oxygen (O) |
| Country of Type Locality: | USA |
| Year First Published: | 1824 |
| IMA Status: | Approved,Grandfathered |
| Status Notes: | Bowen G T (1824) Description and analysis of sillimanite, a new mineral, American Journal of Science and Arts 8, 113-118 |
| Structural Group Name: | Not in a structural group |
| Fleischer's Group Name: | andalusite |
| Crystal Systems: | orthorhombic |
| Oldest Known Age: | 3640 Million Years Ago |
| Mohs Hardness: | 7.0 |
| Diaphaneity: | 2.0 |
| Specific Gravity: | 3.24 |
| Dispersion: | 0.015 |
| More Info: | Search Wikipedia: Sillimanite (Wiki) Search Mindat: Sillimanite Search Web Mineral DB: Sillimanite |