mineral

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Green with aventurescence (shimmer), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.64-2.69

Hardness: 6

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Green with aventurescence (shimmer), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.64-2.69

Formation & geological history

Formed as a metamorphic rock, specifically a quartzite, where silica-rich fluids permeate and crystallize with inclusions of green fuchsite mica, which gives it the characteristic color and sparkle.

Uses & applications

Used widely in ornamental carvings, jewelry (beads, cabochons), tumbled stones for collecting, and as a decorative stone in architecture.

Geological facts

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

Field identification & locations

Look for the metallic 'spangles' or shimmer known as aventurescence. Commonly found in India, Brazil, Russia, and Tanzania. Often confused with jade or emerald, but the shimmer is a key identifier.