Fuchsite

Fuchsite is a green chrome-containing variety of Muscovite.
General Information
A variety or type of:Muscovite
Varieties/Types:
Verdite - A green ornamental stone, primarily an impure Fuchsite from South Africa.
Chemical Formula
K(Al,Cr)
 
3
Si
 
3
O
 
10
(OH)
 
2
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Fuchsite
Mohs Hardness2.5 to 0
Anthony et al, Handbook of Mineralogy (2001)
Specific Gravity2.77 to 2.88
Anthony et al, Handbook of Mineralogy (2001)
Cleavage QualityPerfect
Anthony et al, Handbook of Mineralogy (2001)
Optical Properties of Fuchsite
Refractive Index1.552 to 1.618
Anthony et al, Handbook of Mineralogy (2001)
Optical CharacterBiaxial/-
Anthony et al, Handbook of Mineralogy (2001)
Colour
Colour (General)Green, greenish
Gemdat.org, Management Team (2012)
Causes of ColourGreenish colour, high in chromium (trivalent Cr replaces Al in the crystal structure)
Gemdat.org, Management Team (2012)
TransparencyTransparent,Translucent
Anthony et al, Handbook of Mineralogy (2001)
LustreVitreous,Silky,Pearly
Anthony et al, Handbook of Mineralogy (2001)
Crystallography of Fuchsite
Crystal SystemMonoclinic
Anthony et al, Handbook of Mineralogy (2001)
Further Information
Mineral information:Fuchsite information at mindat.org
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