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Mineralpedia Details for Fluorannite

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Fluorannite

Fluorannite

Formula
KFe2+3(Si3Al)O10F2 
Crystal System
Monoclinic 
Crystal Habit
Foliated, Fibrous, Tabular 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
iron black 
Streak
gray 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
WebMineral
View Fluorannite 
Mindat
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Fluorannite from Katugin Ta-­Nb deposit, Kalarsky dist., Zabaykalsky Krai, Russia

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.

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