metamorphic

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)

AI-generated identification · may be incorrect

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

Identified April 15, 2026More metamorphic →

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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.