FUCHSITE

    Class : Silicates
    Subclass : Phyllosilicates
    Crystal system : Monoclinic
    Chemistry : KAl2(Si3Al)O10(OH,F)2
    Rarity : Rare

Fuchsite is a chrome variety of muscovite, characterized by a beautiful green color. Muscovite has the very characteristic habit of fine strips that are easy to cut with a nail. Fuchsite is the muscovite of ultrabasites, rocks in which chromium is abundant and easily mobilized. It was named in honor of the German mineralogist J. N. von Fuchs. Quartzites with disseminated flakes of fuchsite are rocks with a very aesthetic appearance used for the manufacture of art objects in Guatemala and as ornamental stone in Brazil.

Main photo : Fuchsite from Minas Gerais Brazil © Shann Whynot-Young

Fuchsite from Mwinilunga District, Zambia © Bruce Cairncross
Fuchsite from Uspenskaya Hill, Berezovsk, Russia © Leon Hupperichs
118 ct fuchsite cabochon from Minas Gerais, Brazil
Ruby in fuchsite of 57.00 ct from India

Fuchsite in the World

Fuchsite is known from ultrabasic contexts at Outokumpu (Finland), Mariposa (California), and from a Brazilian quartzite mined for the decoration.

Fuchsite in France

In France, fuchsite is present in the listvaenites of the old Châtelet gold mine (Creuse), and in flakes exceeding 1 cm in the altered ultrabasic rocks of Bilhéric, on the island of Groix (Morbihan). It is also reported in Villefranche-de-Rouergues (Aveyron), Nontron (Dordogne), as well as in many other localities.

Twinning

No twin known for this mineral species.

Fakes and treatments

No fakes recorded for this mineral species.


Hardness : 2.5
Density : 2.7 to 2.8
Fracture : Micaceous
Streak : Green to brown

TP : Translucent to transparent
RI : 1.552 to 1.618
Birefringence : 0.035 to 0.042
Optical character : Biaxial -
Pleochroism : Visible
Fluorescence : None

Solubility : Insoluble


Magnetism : None
Radioactivity : None

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