Green Aventurine

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.

Identified on: 4/28/2026

Mode: Standard