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NAT THWE
Spinel crystals are so perfect, in Burma they are said to be nat thwe or “polished by the spirits.”
BLACK PRINCE
The famous 14th century Black Prince’s Ruby in the British Imperial Crown is actually a red spinel.
1783
Mineralogist Jean Baptiste Louis Rome de Lisle identifies spinel as a different mineral than ruby.
FACTS
- Mineral: spinel
- Chemistry: MgAl2O4
- Color: red, orange, pink, purple, blue, black
- Refractive index: 1.718
- Birefringence: none
- Specific gravity: 3.60
- Mohs Hardness: 8
source:gia.edu
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