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Mineralpedia Details for Tetraferriphlogopite

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Tetraferriphlogopite

Tetraferriphlogopite

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal with Mg, some substitutions for of Fe3+ for silicon at the (T) positions and OH>F at (A) otherwise would be Fluorotetraferriphlogopite.

Found in ultrabasic alkaline massif of Kovdor.

Formula
KMg3(Si3Fe3+)O10(OH)2 
Crystal System
Monoclinic 
Class
Monoclinic - Prismatic 
Hardness
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Tetraferriphlogopite from Iron mine, Kovdor Massif, Kola Peninsula, Russia

Tetraferriphlogopite
            from Iron mine, Kovdor Massif, Kola Peninsula, Russia

Dark bronze colored pseudo-hexagonal, prismatic crystals to 1.2cm. Member of the Mica gropu, submember - Biotite.

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