mineral

Fuchsite

Chromium-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Hardness: 2-2.5 (Mohs scale); Color: Emerald green to light green; Luster: Pearly to vitreous; Crystal structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific gravity: 2.80-2.88.

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

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through regional metamorphism in phyllites and schists, particularly those rich in chromium. Found in rocks dating back to the Archean through Proterozoic eons.

Uses & applications

Used primarily as decorative stone, for carving figurines, in lapidary work (cabochons), and as a minor gemstone for collectors. Also used as a pigment or glitter source.

Geological facts

Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. When mixed with large amounts of quartz, it forms a popular gemstone variety known as Green Aventurine.

Field identification & locations

Identify in the field by its distinctive green color, micaceous (sheet-like) habit, and low hardness (scratched by a fingernail). Common locations include Brazil, India, Zimbabwe, and Russia.

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