mineral

Tumbled green aventurine (probable)

Quartz aggregate, predominantly SiO₂, with green fuchsite mica inclusions

AI-generated identification · may be incorrect

Translucent pale green, smoothly tumbled, with weakly mottled texture and low vitreous-to-waxy luster. Quartz hardness is about Mohs 7; no obvious cleavage; specific gravity ~2.6. The rounded shape indicates human tumbling and polishing.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz-rich rocks crystallize with reflective green fuchsite mica, giving the characteristic green color. Such material is commonly associated with metamorphic or hydrothermal quartz veins, generally of variable Precambrian to younger age.

Uses & applications

Used for beads, cabochons, carvings, ornamental stone, and inexpensive metaphysical specimens. Typical value is about $2–$15 for a palm-sized tumbled piece; finer saturated material may reach $20–$50.

Geological facts

The photograph supports aventurine but cannot exclude green chalcedony, nephrite, serpentine, or dyed quartz without testing. Aventurine’s glitter is usually strongest when viewed under directional light.

Field identification & locations

Common sources include India, Brazil, Russia, Tanzania, and China; it is not unusual in Australian crystal shops, though the specimen was likely imported. Check for tiny mica sparkles, glassy quartz-like edges, and hardness sufficient to scratch ordinary glass; a streak, hardness, and specific-gravity test would improve confidence.