metamorphic
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69; Notable feature: Aventurescence (a shimmering effect caused by mineral inclusions).
- Hardness
- 6
- Color
- Translucent to opaque 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 on Mohs scale; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69; Notable feature: Aventurescence (a shimmering effect caused by mineral inclusions).
Formation & geological history
Formed as a metamorphic rock, specifically a quartzite, where high heat and pressure recrystallize quartz grains. The green color comes from chromium-rich mica (fuchsite) that crystallizes simultaneously within the quartz matrix. Most deposits range from Proterozoic to more recent geological ages.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, aquarium gravel, and as a popular 'healing stone' in metaphysical practices. It is occasionally used for ornamental building veneers.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of 'aventurine glass' in the 18th century, which looks remarkably similar to the natural stone.
Field identification & locations
Identify by its characteristic 'speckled' or 'glittery' green appearance caused by mica flakes. Common locations include India (the largest producer), Brazil, Russia, and Austria. In the field, look for a lack of cleavage and a granular, quartzite-like texture.
More like this
