mineral

Aventurine

Silicon Dioxide (SiO2) with inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Pale to deep green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None, Specific gravity: 2.64-2.69

Hardness: 6

Identified May 3, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Pale to deep green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None, Specific gravity: 2.64-2.69

Formation & geological history

Formed in metamorphic rocks and igneous veins when molten silica or quartz recrystallizes with trapped mineral inclusions, typically fuchsite mica which gives the green color.

Uses & applications

Used primarily in lapidary work for jewelry, figurines, cabochons, and ornamental carvings; also popular in metaphysical collections.

Geological facts

The name comes from Italian 'a ventura', meaning 'by chance', originally referring to accidental production of goldstone glass. Natural aventurine is known for 'aventurescence', a shimmering effect caused by platy mineral inclusions.

Field identification & locations

Identify by its characteristic green color and shimmering mica flecks when turned under light. Commonly found in India, Brazil, and Russia. Used as a lower-cost alternative to jade.