Mineralpedia Details for 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
- 3
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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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