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Micaceous Minerals 2

Monday, 10 April 2017 08:00 AM

Not all micaceous looking minerals fall in the MICA group of phyllosilicate minerals. Many of the other silicates appear micaceous but are not. We'll have a look at some of these minerals and hopefully explain the difference. Take a look at our article on Mica and Other Micaceous Minerals.

Tetraferriphlogopite

#46483
Locality
Turii alkaline Massif, Kola Peninsula, Russia 
Formula
KMg3(Fe3+Si3O10)(OH,F)2 
Availability
Available
Price
$35.00
Size
Chip < 1cm 

Tiny reddish plates in Quartz. Positively identified by Dr. Igor Pekov.

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.


Tetraferriphlogopite

Formula
KMg3(Si3Fe3+)O10(OH)2 
Crystal System
Monoclinic 
Class
Monoclinic - Prismatic 
Hardness

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