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Fluorannite in cryolite

#46458

Fluorannite in cryolite

#46458
Availability
Sold
Size
3 x 2 x 1 cm - Thumbnail 
Formula
KFe2+3(Si3Al)O10F2 (RRUFF)
Locality
Katugin Nb-REE deposit, Siberia, Russia

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.

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

Data courtesy of Webmineral.

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