mineral

Tumbled green aventurine quartz

Quartz, SiO₂, with fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Typically pale to medium green, translucent to opaque, with a waxy or subtly sparkly aventurescence; Mohs hardness 7, trigonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded shape indicates tumbling and polishing.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich material crystallizes with disseminated green fuchsite mica, chlorite, or sometimes actinolite; deposits are commonly Precambrian to younger metamorphic rocks. Major sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive healing-stone specimens; rarely used industrially beyond quartz aggregate applications.

Geological facts

Aventurine’s characteristic shimmer comes from light reflecting off aligned mineral platelets; this specimen appears relatively low in aventurescence and could also be green quartzite or dyed material.

Field identification & locations

Identify by hardness, quartz-like fracture, and mica sparkle; it should scratch glass but not be scratched by steel. Confirmatory testing requires microscopy or gemological analysis because color alone is not diagnostic.