Fuchsite | Gemopedia

Fuchsite is a chromium-bearing green to greenish-blue variety of muscovite. Named after J.N. von Fuchs, a 19th century German geologist, fuchsite is often used as an ornamental stone but also makes a great addition to a mineral specimen.
Alternate
Names
Muscovite, Common Mica
Colors
Green

Fuchsite Classification

Common Name

Fuchsite

Species

Muscovite

Variety

Fuchsite

Colors

green

Alternate Names

muscovite, common mica

Gemstone Groups

Group: Mica

Key Separations

Comments

Fuchsite is the chromium rich variety of muscovite.

Fuchsite Optical Properties

Transparency

Transparent To Translucent

Refractive Index

1.552-1.615

Birefringence

0.036

Optic Character

biaxial

Optic Sign

negative

Polariscope Reaction

doubly refractive (DR) or AGG depending on transparency

Fluorescence

CCF Reaction

Pleochroism

Dispersion

Strength: weak fire

Comments

Fuchsite Chemistry & Crystallography

Chemical Name

Chemical Formula

K(Al,Cr)2[(OH,F)2/AlSi3O10]

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Fuchsite Characteristic Physical Properties

Hardness

23

Streak

light green, white

Specific Gravity

2.8-2.9

Toughness

Inclusions

Luster

Vitreous To Silky

Stability

Fracture

Cleavage

Perfect

Comments

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