metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 7 Mohs; Color: Mottled green with white/tan streaks; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.69. Displays 'aventurescence' (shimmering effect).
- Hardness
- 7 Mohs
- Color
- Mottled green with white/tan streaks
- Luster
- Vitreous to waxy
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 Mohs; Color: Mottled green with white/tan streaks; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.69. Displays 'aventurescence' (shimmering effect).
Formation & geological history
Formed as a result of regional metamorphism of quartz-rich sedimentary rocks (sandstone) into quartzite, where mica inclusions (fuchsite) provide the distinct green color. Most deposits are found in Precambrian metamorphic terrains.
Uses & applications
Predominantly used for lapidary work, decorative carvings, metaphysical 'towers' or 'obelisks', cabochon jewelry, and historical garden ornamentation.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to Italian glass made by accidentally dropping copper filings into molten glass.
Field identification & locations
Identify by its characteristic green color combined with a shimmering or sparkling effect when rotated under light. Commonly found in India (where most commercial 'Green Aventurine' originates), Brazil, Russia, and Tanzania.
More like this
