mineral

Fuchsite

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

Hardness: 2-3 on Mohs scale; Color: Emerald green to light green; Luster: Pearly to vitreous; Crystal structure: Monoclinic (often found in micaceous, foliated masses); Cleavage: Perfect basal; Specific Gravity: 2.8 - 2.9

Hardness: 2-3 on Mohs scale
Color: Emerald green to light green
Luster: Pearly to vitreous

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed through regional metamorphism. It is a chromium-rich variety of muscovite mica, typically found in phyllites or schists where chromium-bearing fluids have interacted with mica-forming minerals.

Uses & applications

Primarily used as a minor gemstone, in lapidary work for cabochons or carvings, and as a decorative stone. It is also a popular specimen for mineral collectors and sometimes used in pigment production.

Geological facts

The vibrant green color is caused by the presence of trivalent chromium replacing aluminum in the crystal structure. It is often found associated with ruby crystals (a combination known as Ruby-in-Fuchsite), where the green of the fuchsite contrasts beautifully with the red rubies.

Field identification & locations

Identify in the field by its distinct bright green color and 'sparkly' or metallic-pearlescent sheen characteristic of micas. It is very soft and can be scratched with a fingernail. Common locations include Brazil, India, Zimbabwe, and the Ural Mountains in Russia.

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