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Fluor-Elbaite (Tourmaline Group)
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Fluor-Elbaite (Tourmaline group)
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IMA Status: |
New mineral approved in October 2011 |
Variety of Fluor-Elbaite: |
Indicolite |
Classification: |
Silicates, Cyclosilicates, Tourmaline Group |
Chemical formula: |
Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F |
Crystal system: |
Trigonal |
Density (g/cm3): |
2.9 - 3.1 measured, 3.069 calculated |
Cleavage: |
None observed, sometimes jointing along vertical C axis |
Fracture: |
Sub-conchoidal |
Hardness (Mohs): |
7.5 |
Colour: |
Blue-green |
Lustre: |
Vitreous |
Streak: |
White |
Transparency: |
Transparent, translucent |
Co-type locality: |
Urubu mine, Monte Belo, Itinga, Minas Gerais, Brazil & Cruzeiro mine, São José da Safira, Minas Gerais, Brazil |
Application: |
Gemstone |
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