Fluorannite from Katugin Ta-Nb deposit, Kalarsky dist., Zabaykalsky Krai, Russia. Black micaceous crystals to 1mm. Rare. Fluorannite is the fluorine analogue of Annite. It is basically compact black and micaceous. It is actualy quite rare having been found in only three worldwide localities thus far. Click thumbnail images for larger view.
Name: In allusion to the composition, containing dominant fluorine, and its chemical relationship to annite. Type Locality: ⓘ Western suburb, Suzhou City, Suzhou, Jiangsu, China. Mica Group. The fluorine analogue of annite and the Fe 2+ analogue of fluorophlogopite. Also the K analogue of UM2003-27-SiO:AlCsFFeHLi.
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