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Phlogopite

#PD46683
SOLD
Phlogopite from Otter Lake, Quebec, Canada - PD46683
Phlogopite from Otter Lake, Quebec, Canada - PD46683

Phlogopite

#PD46683
Availability
Sold
Size
8 x 5 x 5 cm - Sm Cabinet 
Formula
KMg3(Si3Al)O10(OH)2 (RRUFF)
Locality
Otter Lake, Quebec, Canada

Dark almost black mass of Phlogopite mica.

Phyllosilicate - Monoclinic - Mica group member. Phologpite is classified as an Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.

Phlogopite

Formula
KMg3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Scaly, Lamellar 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
brown, gray, green, yellow, reddish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
2-2.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
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