metamorphic
Fuchsite-bearing Quartzite (Green Quartzite)
Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartzite
Hardness: 6-7 (Mohs); Color: Emerald green patches, white, and silver-grey; Luster: Vitreous to pearly; Crystal structure: Crystalline/Granular; Specific gravity: approx. 2.6-2.8.
- Hardness
- 6-7 (Mohs)
- Color
- Emerald green patches, white, and silver-grey
- Luster
- Vitreous to pearly
Identified More metamorphic →
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Physical properties
Hardness: 6-7 (Mohs); Color: Emerald green patches, white, and silver-grey; Luster: Vitreous to pearly; Crystal structure: Crystalline/Granular; Specific gravity: approx. 2.6-2.8.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone containing chromium-bearing clay minerals or through hydrothermal alteration. The green color is derived from chromium atoms replacing aluminum in the mica structure.
Uses & applications
Used primarily as a decorative stone, for cabochons in jewelry, and in aquarium landscaping or as a lapidary material. It is also popular in holistic and metaphysical crystal collecting.
Geological facts
Fuchsite is a chromium-rich variety of muscovite. When it occurs as small inclusions within quartzite, it creates a stone often called 'Green Aventurine' if the mica is evenly distributed and sparkly, or 'Green Quartzite' if it is more massive.
Field identification & locations
Identified by its distinctive sparkly green mineral flecks (micaceous) embedded in a hard, scratch-resistant quartz matrix. Commonly found in Brazil, India, and parts of Russia. In the field, look for a stone that scratches glass but shows a visible micaceous shimmer.
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