metamorphic
Fuchsite Quartzite (Green Quartzite)
Fuchsite-bearing Quartzite (K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2)
Hardness: 6-7 (Quartz content); Color: Pale to emerald green with white or tan streaks; Luster: Vitreous to pearly; Crystal structure: Non-foliated to weakly foliated crystalline; Cleavage: None (conchoidal fracture); Specific gravity: ~2.65
- Hardness
- 6-7 (Quartz content)
- Color
- Pale to emerald green with white or tan streaks
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Quartz content); Color: Pale to emerald green with white or tan streaks; Luster: Vitreous to pearly; Crystal structure: Non-foliated to weakly foliated crystalline; Cleavage: None (conchoidal fracture); Specific gravity: ~2.65
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone containing chromium-bearing minerals. The presence of fuchsite (a mica) provides the characteristic green tint under high-pressure and high-temperature conditions.
Uses & applications
Used primarily for ornamental purposes, landscaping, aquarium stones, and occasionally as a semi-precious gemstone for cabochons or carvings.
Geological facts
The vibrant green color is caused by trace amounts of chromium. When the fuchsite content is very high and flaky, the stone is often referred to as 'Aventurine.'
Field identification & locations
Identify by its hardness (will scratch glass) and its characteristic green 'mica' flakes that often glitter slightly under light. Commonly found in Brazil, India, and parts of the United States like Arizona.
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