Phlogopite

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Phlogopite
Missing image
Phlogopite.jpg
A phlogopite crumbled cleavage plate

A phlogopite crumbled cleavage plate

General
CategoryMineral
Chemical formula K(Mg,Fe,Mn)3Si3AlO10(F,OH)2)
Identification
Colour Yellowish- or greenish-brown
Crystal habit Tabular, scaly masses, often small flakes in acid igneous rocks.
Crystal system Monoclinic
Cleavage Basal
Fracture Bends without breaking
Mohs Scale hardness 3
Luster Pearly, sometimes slightly metallic
Refractive index Trasparent
Pleochroism None
Streak Colorless
Major varieties
None

Phlogopite is a yellow, greenish or reddish brown member of the mica family of phyllosilicates. It is also known as magnesium mica. Phlogopite is the magnesium endmember of the biotite solid solution series. It occurs in contact metamorphic zones around intrusives into magnesium rich limestones, dolostone, and in some ultramafic igneous rocks.

External links

ja:金雲母 pl:Flogopit

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