Aventurine

Physical Properties

Hardness: 6.5-7 Mohs. Color: Light to dark green with 'aventurescence' (shimmering). Luster: Vitreous to waxy. Crystal Structure: Hexagonal/Trigonal. Specific Gravity: 2.64-2.69.

Formation & Geological History

Formed through the regional metamorphism of quartz-rich sandstones into quartzite, where mica minerals like fuchsite are incorporated under heat and pressure. Most specimens are from the Proterozoic or Paleozoic eras.

Uses & Applications

Commonly used in jewelry (cabochons, beads), decorative carvings, aquarium gravel, and as a popular stone for crystal healing and metaphysical collecting.

Geological Facts

The name comes from the Italian 'a ventura,' meaning 'by chance,' referencing the accidental discovery of aventurine glass in the 18th century which looks similar to this natural stone.

Field Identification & Locations

Identify by its characteristic platy shimmer (aventurescence) caused by green mica inclusions. Found frequently in India, Brazil, and Russia. It can be distinguished from jade by its lower toughness and slight sparkling quality.

Identified on: 4/20/2026

Mode: Standard