metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)
Hardness: 2.5-3 (fuchsite) to 7 (quartz); Color: Emerald green with white/tan matrix; Luster: Pearly to Vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal.
- Hardness
- 2
- Color
- Emerald green with white/tan matrix
- Luster
- Pearly to Vitreous
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Physical properties
Hardness: 2.5-3 (fuchsite) to 7 (quartz); Color: Emerald green with white/tan matrix; Luster: Pearly to Vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks or the hydrothermal alteration of ultramafic rocks, often found in phyllites and schists.
Uses & applications
Primarily used as an ornamental stone, for lapidary work (cabochons), and as a collector's specimen. It is also significant in holistic and metaphysical communities.
Geological facts
The vibrant green color of fuchsite is caused by small amounts of trivalent chromium replacing aluminum in the mica structure; it's often confused with verdite.
Field identification & locations
Identify by its distinctive flaky green mica (fuchsite) embedded within a hard white or grey quartz matrix. Commonly found in Brazil, India (where it is often called 'Green Aventurine' in mass), and Russia.
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