metamorphic
Adventurine (Green Quartz)
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs); Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.69; Distinct feature: Aventurescence (metallic glitter).
- Hardness
- 6
- Color
- Pale to dark green
- Luster
- Vitreous to waxy
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.69; Distinct feature: Aventurescence (metallic glitter).
Formation & geological history
Formed in metamorphic environments where quartz-rich sediments or rocks undergo heat and pressure, allowing Chromium-rich Fuchsite mica to develop and disperse within the quartz matrix.
Uses & applications
Primarily used for jewelry, lapidary arts, ornamental carvings, and 'healing stone' collections. Historically used for making tools and stone sculptures.
Geological facts
The name comes from 'a ventura' (by chance), referring to the 18th-century discovery of Goldstone glass, which looks similar. It is often called the 'Stone of Opportunity' in metaphysical circles.
Field identification & locations
Identify by its characteristic green mottling and the subtle internal shimmering reflections (aventurescence) when turned under light. Found extensively in India, Brazil, and Russia.
More like this
