mineral

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Hardness: 2-3 Mohs; Color: Emerald green to pale light green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (micaceous); Cleavage: Perfect basal; Specific Gravity: 2.8-3.0.

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

Identified March 22, 2026More mineral →

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Physical properties

Hardness: 2-3 Mohs; Color: Emerald green to pale light green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (micaceous); Cleavage: Perfect basal; Specific Gravity: 2.8-3.0.

Formation & geological history

Metamorphic mineral formed through the alteration of chromium-rich minerals in low-grade metamorphic rocks (phyllites and schists). Often associated with hydrothermal activity in ultramafic environments.

Uses & applications

Used primarily as a minor gemstone, in lapidary work for cabochons/carvings, and as an ornamental stone. Significant collector value due to its distinct coloration.

Geological facts

Fuchsite is a chromium-rich variety of muscovite. When it is found as inclusions within quartz, it creates the shimmering green gemstone known as Aventurine.

Field identification & locations

Identify in the field by its distinct green color, flaky/micaceous texture that leaves glitter-like residue on skin, and softness. Commonly found in Brazil, India, and Zimbabwe.