Fluor-Elbaite (Tourmaline group)
Fluor-Elbaite (Indicolit)
Item-No.: MINS5108 Price: 352.00 EUR
São José da Safira, Minas Gerais, Brazil
| 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 |