mineral

Tumbled green aventurine quartz (probable)

Quartz, SiO₂, with fuchsite mica inclusions

AI-generated identification · may be incorrect

Hardness about 7 Mohs; green with darker glittery or mottled patches, vitreous to slightly dull luster, translucent to opaque, and no obvious cleavage. The rounded surface indicates tumbling or polishing.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz containing chromium-bearing fuchsite mica, commonly in metamorphic rocks; specimens are generally Precambrian to younger, depending on locality.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornaments, and lapidary material; it is also sold under various decorative and metaphysical names.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mica or hematite inclusions. The pictured stone could also be green serpentine or dyed quartz, which cannot be confirmed visually alone.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Check for mica sparkle, quartz-like hardness, and resistance to scratching by steel; a gemological test is needed for confident identification.