Metamorphic
Green Quartz / Aventurine
Silicon Dioxide (SiO2) with inclusions
Hardness: 7 on Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.63 - 2.65
- Hardness
- 7 on Mohs scale
- Color
- Pale green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.63 - 2.65
Formation & geological history
Formed through the metamorphism of sandstone into quartzite, where impurities such as fuchsite mica impart a green color. It typically forms in orogenic metamorphic belts.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, aquarium gravel, and as a healing stone in metaphysical practices.
Geological facts
Aventurine displays a unique shimmering effect called 'aventurescence' caused by tiny platy mineral inclusions that reflect light. It is often confused with jade or emerald by non-experts.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and the presence of tiny sparkly inclusions (fuchsite). Commonly found in Brazil, India, Russia, and Tanzania.
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