metamorphic
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
Hardness: 7 (Mohs scale); Color: Pale to olive green with a mottled texture; Luster: Vitreous to waxy; Structure: Granular/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.7
- Hardness
- 7 (Mohs scale)
- Color
- Pale to olive green with a mottled texture
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale to olive green with a mottled texture; Luster: Vitreous to waxy; Structure: Granular/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, quartz grains recrystallize and fuse together. The green hue typically comes from the presence of Fuchsite (chromium mica) or chlorite minerals during the recrystallization process.
Uses & applications
Used primarily in decorative landscaping, aquarium stones, and low-end jewelry or carvings. In industrial contexts, crushed quartzite is used as a source of silica and in road construction.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock, forming prominent ridges and hills. When it contains sparkling inclusions of green fuchsite, it is specifically referred to as Green Aventurine.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife (unlike soapstone or serpentinite) and its granular, sugary appearance on fresh surfaces. Frequently found in riverbeds or glacial deposits in mountainous regions.
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