mineral

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Hardness: 2-2.5 (Mohs), Color: Emerald green to light green, Luster: Vitreous to pearly, Crystal Structure: Monoclinic (often massive or micaceous plate-like flakes), Cleavage: Perfect basal (peels into thin sheets).

Hardness: 2-2

Identified March 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed through regional metamorphism in phyllites or schists. The characteristic green color comes from chromium substituting for aluminum in the crystal lattice. Usually found in metamorphism contexts ranging from the Archean era to more recent periods.

Uses & applications

Used primarily as decorative stone, in lapidary work for cabochons, as an ingredient in glitter-like industrial paints, and is popular in metaphysical or mineral collecting communities.

Geological facts

Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. It is a variety of muscovite mica and is the reason behind the green color in 'Aventurine' quartz when it appears as inclusions.

Field identification & locations

Identify in the field by its distinct flaky, micaceous texture (scratches easily with a fingernail) and bright green color. Common locations include Brazil, India, Russia, and South Africa. For collectors, look for high chromium content which provides a deeper emerald green.

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