| Musgravite | |
| Category: | Oxide minerals |
| Formula: | (Mg,Fe,Zn)2BeAl6O12 |
| Strunz: | 04.FC.25 |
| Color: | Grey green to green |
| System: | Trigonal |
| Fracture: | Conchoidal |
| Mohs: | 8–8.5 |
| Luster: | Vitreous |
| Refractive: | nω = 1.739, nε = 1.735 |
| Opticalprop: | Uniaxial |
| Birefringence: | δ = 0.014 to 0.016 |
| Gravity: | 3.62–3.68 |
| Diaphaneity: | Transparent |
Musgravite or magnesiotaaffeite-6N’3S is a rare oxide mineral used as a gemstone. Its type locality is the Ernabella Mission, Musgrave Ranges, South Australia, for which it was named following its discovery in 1967. It is a member of the taaffeite family of minerals,[1] [2] and its chemical formula is Be(Mg, Fe, Zn)2Al6O12. Its hardness is 8 to 8.5 on the Mohs scale.[1] Due to its rarity, the mineral can sell for roughly USD$35,000 per carat.