mineral

Fuchsite

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

Hardness: 2-3 (Mohs). Color: Distinctive emerald green to light green with silver-white mica flakes. Luster: Pearly to vitreous. Crystal structure: Monoclinic (typically micaceous/platey). Cleavage: Perfect basal cleavage. Specific gravity: 2.8 - 2.9.

Hardness: 2-3 (Mohs)
Luster: Pearly to vitreous

Identified March 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed through regional metamorphism in schist and phyllite rocks. The green color comes from chromium replacing aluminum in the mica structure. It is often found in environments rich in aluminum and chromium-bearing minerals.

Uses & applications

Used primarily as decorative carvings, ornamental stones, and in the metaphysical/gemstone market. It is often used as an industrial source of chromium or as a filler in paints and plastics, though its primary value today is for mineral collectors and lapidary work.

Geological facts

Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. It is a variety of Muscovite. When it grows together with ruby crystals, the specimen is known as 'Ruby in Fuchsite,' a popular gemstone combination.

Field identification & locations

Identify in the field by its emerald green color, soft texture (can often be scratched by a fingernail), and the presence of shimmering micaceous 'glitter.' Commonly found in Brazil, India, South Africa, and Russia. Collectors should look for specimens that don't crumble easily, as high mica content makes it fragile.

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