mineral

Tumbled green aventurine (likely)

Quartz, SiO₂, with fuchsite or other green inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, translucent to opaque green, and vitreous to waxy luster; massive quartz lacks visible crystal faces and cleavage, with uneven conchoidal fracture. The rounded shape indicates mechanical tumbling and polishing.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed in silica-rich veins or metamorphic rocks, while green color commonly comes from chromium-bearing fuchsite mica; formation is generally Precambrian to Phanerozoic depending on locality. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for inexpensive cabochons, beads, carvings, tumbled stones, décor, and collectors’ specimens; it has limited industrial use compared with ordinary quartz.

Geological facts

Aventurine’s characteristic color is caused by mineral inclusions rather than the quartz itself. Strong glitter, called aventurescence, is typical, though this specimen appears relatively subdued.

Field identification & locations

Identify it by its green body color, quartz-like hardness, translucent edges, and possible fine mica sparkle; glass imitations are usually softer and may show bubbles. Exact identification would require microscopy or analytical testing.