mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂) with fuchsite or other green inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent to opaque green, vitreous/waxy luster, granular quartz crystal structure, and no obvious cleavage. The smooth rounded surface indicates tumbling or polishing.

Identified September 17, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; translucent to opaque green, vitreous/waxy luster, granular quartz crystal structure, and no obvious cleavage. The smooth rounded surface indicates tumbling or polishing.

Formation & geological history

Usually forms when quartz-rich sandstone or vein material recrystallizes into quartzite, with chromium-bearing mica (fuchsite) producing the green color; commonly Precambrian to younger metamorphic material. The exact specimen cannot be confirmed from an image alone.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive decorative stone; occasionally used as aggregate or facing material.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica or mineral inclusions; this piece appears relatively low-sparkle and may also be dyed green quartzite or serpentine.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Check hardness, streak, and sparkle: quartz-rich aventurine resists scratching by steel, while serpentine is softer; avoid relying on color alone.