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Fluor-Elbaite (Tourmaline group)

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Fluor-Elbaite (Indicolit)
São José da Safira, Minas Gerais, Brazil

Item-No.: MINS5108
Price: 352.00 EUR 

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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