Musgravite

Musgravite, Be(Mg, Fe, Zn)2Al6O12, is a gemstone reportedly named after the Musgrave Ranges, Australia, where it was first discovered. It is a synonym of magnesiotaaffeite-6N’3SIt, a member of the taaffeite family of minerals.[1][2][3] Its hardness is 8 to 8.5 on the Mohs scale.[4] It is one of the rarest gemstones on Earth; only two faceted gems are known.[5]

References

  1. ↑ Magnesiotaaffeite-6N’3S on Mindat
  2. ↑ Multicolour.com > Gem Library > Gemstones Varieties > Musgravite
  3. ↑ Gemdat
  4. ↑ Magnesiotaaffeite-6N’3S on Mindat
  5. ↑ http://listverse.com/2007/12/02/top-10-rarest-gems/