metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.64-2.69; Distinctive for 'aventurescence' (a metallic glitter caused by tiny mica flakes).
- Hardness
- 6
- Color
- Pale to medium 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 scale); Color: Pale to medium green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.64-2.69; Distinctive for 'aventurescence' (a metallic glitter caused by tiny mica flakes).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstones into quartzite, where the inclusion of chromium-rich muskcovite (fuchsite) during crystallization provides the green hue. These formations range from hundreds of millions to billions of years old.
Uses & applications
Primarily used for ornamental purposes, including beads, cabochons, carvings, and tumbled stones for jewelry and metaphysical collections. Occasionally used in landscaping or small architectural accents.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referring to the 18th-century accidental discovery of 'aventurine glass' (goldstone) which looked similar to this natural stone. It is often called the 'Stone of Opportunity.'
Field identification & locations
Identify in the field by its hardness (will scratch glass) and the presence of internal mica flakes that shimmer under light. Common locations include India (the primary source), Brazil, Russia, and Austria. Collectors should look for even color distribution and strong aventurescence.
More like this
