Aventurine

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Green (from fuchsite); Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.69

Formation & Geological History

Forms in metamorphic rocks such as quartzites when quartz is subjected to high heat and pressure, allowing mica or chlorite to infiltrate the quartz structure.

Uses & Applications

Used primarily in jewelry (cabochons, beads), decorative carvings, meditation stones, and metaphysical practices.

Geological Facts

The name comes from the Italian 'a ventura' meaning 'by chance,' referring to the discovery of aventurine glass (goldstone) which mimicked this mineral's natural sparkle.

Field Identification & Locations

Identify by its 'aventurescence' (a metallic glitter caused by tiny mica inclusions). Commonly found in India, Brazil, and Russia. Look for a granular, sugary texture in green hues.

Identified on: 5/4/2026

Mode: Standard