metamorphic
Green Quartzite / Aventurine
Quartzite (SiO2 with fuchsite/chlorite inclusions)
Hardness: 7 on Mohs scale; Color: Pale light green to sea-foam green; Luster: Waxy to dull or vitreous when polished; Crystal structure: Trigonal (microcrystalline aggregate); Cleavage: None; Specific gravity: ~2.65
- Hardness
- 7 on Mohs scale
- Color
- Pale light green to sea-foam green
- Luster
- Waxy to dull or vitreous when polished
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale light green to sea-foam green; Luster: Waxy to dull or vitreous when polished; Crystal structure: Trigonal (microcrystalline aggregate); Cleavage: None; Specific gravity: ~2.65
Formation & geological history
Formed via regional metamorphism of quartz-rich sandstone containing chromium-bearing mica (fuchsite) or chlorite, which imparts the distinctive greenish tint.
Uses & applications
Used for lapidary work, decorative carvings, cabochons for jewelry, landscaping, and ornamental stones.
Geological facts
Green quartzite is often mistaken for jade due to its color and smooth river-worn texture, but it is significantly harder and composed primarily of quartz.
Field identification & locations
Can be identified by its inability to be scratched by a steel knife (Mohs 7), its fine granular quartz texture, and soft pale green color. Common in alluvial gravels and metamorphic zones globally.
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