metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Green with aventurescence (shimmer); Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal; Specific gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green with aventurescence (shimmer)
- 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: Green with aventurescence (shimmer); Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal; Specific gravity: 2.64-2.69
Formation & geological history
Formed through the metamorphism of sandstone into quartzite, where the mica inclusions (fuchsite) align to create a sugary, shimmering effect known as aventurescence. Primarily found in Precambrian shield areas.
Uses & applications
Used widely in lapidary for carvings, beads, and cabochons. Frequently used in jewelry, ornamental statues, and as a popular stone for 'healing crystal' collections.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referencing the discovery of goldstone (a man-made glass) that looks similar accidentally in the 18th century.
Field identification & locations
Identify by its characteristic 'shimmer' caused by green fuchsite mica plates inside. Most commercial specimens come from India, Brazil, and Russia. It can be distinguished from Jade by its lower translucency and the presence of sparkling internal flakes.
More like this
