Phlogopite Phlogopite

Phlogopite - Definition and Overview

Phlogopite
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. 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.

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