mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
AI-generated identification · may be incorrectHardness: 2-2.5 on Mohs scale; Color: Emerald green to light green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect micaceous; Specific Gravity: 2.8 - 2.9
- Hardness
- 2-2
- Color
- Emerald green to light green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-2.5 on Mohs scale; Color: Emerald green to light green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect micaceous; Specific Gravity: 2.8 - 2.9
Formation & geological history
Formed through the regional metamorphism of rocks containing chromium. It is often found in phyllites or schists where hydrothermal activity has altered the chemical composition. It can be found in formations dating back to the Archean era.
Uses & applications
Primarily used as an ornamental stone, for lapidary work (cabochons), and as a decorative mineral specimen. It is also ground for use as a green pigment and glitter in cosmetics and paints.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. Its intense green color is caused by the presence of trivalent chromium replacing aluminum in the mica structure. When fuchsite is found as small inclusions within quartzite, the rock is known as 'Aventurine'.
Field identification & locations
Identify in the field by its distinct bright green color, flaky/micaceous texture, and softness (can be scratched by a fingernail). It is commonly found in Brazil, India, Russia, and South Africa. Collectors should look for its characteristic 'shimmer' or aventurescence when inclusions are present.
