Musgravite
| From The Gemology Project | In affiliation with GemologyOnline.com |
From The Gemology Project
You can contribute to this topic through the submission page.| Musgravite | |
|---|---|
| Chemical composition | Magnesium-beryllium-aluminium oxide
Mg2BeAl6O12 |
| Crystal system | Trigonal |
| Hardness | 8 |
| Optic nature | uniaxial - |
| Refractive index | 1.721 - 1.728 |
| Birefringence | ± 0.004 |
| Specific gravity | ± 3.69 |
| Pleochroism | faint |
| Fluorescence |
LW: inert |
Musgravite is a polytype of taaffeite and is known amongst mineralogists as "magnesiotaaffeite-6N'3S".
The, gemological, name is derived from the Musgrave Ranges in central Australia.
Prior to 2002 this mineral was named "musgravite" by mineralogists aswell as gemologists. We gemologists still use the name "musgravite".
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Sources
- Taaffeite and Musgravite article from the GAAJ
- Hudson D R, Wilson A F, Threadgold I M (1967) A new polytype of taaffeite — a rare beryllium mineral from the granulites of central Australia, Mineralogical Magazine, 36, 305-310
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