mineral

Fuchsite

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

Hardness: 2-2.5 (Mohs scale); Color: Emerald green to light green; Luster: Vitreous to pearly; Crystal structure: Monoclinic (often found in micaceous, foliated masses); Cleavage: Perfect basal; Specific gravity: 2.8 - 2.9

Hardness: 2-2
Color: Emerald green to light green
Luster: Vitreous to pearly

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through regional metamorphism in phyllites and schists. It is a product of hydrothermal alteration and is often associated with chromium-rich rocks (ultramafic rocks). Geological age varies by deposit location.

Uses & applications

Primarily used as a decorative stone and in jewelry (often as cabochons). It is also a popular specimen for mineral collectors and sometimes used in pigment production or as a traditional healing stone.

Geological facts

Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. Its vivid green color is caused by the presence of trivalent chromium replacing aluminum in the crystal lattice. When mixed with ruby, it is known as Ruby in Fuchsite.

Field identification & locations

Identify in the field by its distinct green color, micaceous 'glittery' shine, and the fact it can be easily scratched with a copper penny or fingernail. Commonly found in Brazil, India, Russia, and South Africa.

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