Fluor-elbaite

cyclosilicate

elbaite

Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F
Cyclosilicate (ring silicate), tourmaline group
Specific gravity: 3.1 (AM 98, 297–303)
Hardness: 7½ (AM 98, 297–303)
Streak: White
Colour: Blue-green
Environments:

Pegmatites

At the co-type localities, the Urubu mine and the Cruzeiro mine, Minas Gerais, Brazil, fluor-elbaite is formed in or near miarolitic cavities by late-stage hydrothermal solutions in a zoned granitic pegmatite, associated with quartz, muscovite, lepidolite, spodumene, spessartine and beryl (HOM, Mindat, AM 98.297-303).

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