mineral

Tumbled green aventurine quartz

Aventurine quartz; microcrystalline SiO₂ with dispersed mica or fuchsite inclusions

AI-generated identification · may be incorrect

Pale green, translucent to opaque, with a waxy-to-vitreous luster and subtly sparkly surface; hardness about 6.5–7 Mohs, massive granular structure, and no obvious cleavage. The rounded edges indicate tumbling or natural water wear, with brown host-rock staining or matrix.

Identified September 13, 2026More mineral →

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At a glance

Common name: Tumbled green aventurine quartz
Scientific name: Aventurine quartz; microcrystalline SiO₂ with dispersed mica or fuchsite inclusions
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a palm-sized common tumbled specimen; approximately $20–$50 if unusually attractive, strongly aventurescent, or sold as a quality cabochon.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms when quartz-rich material crystallizes with chromium-bearing fuchsite mica or other green inclusions, commonly in metamorphic or hydrothermal settings. Aventurine deposits are especially known from India, Brazil, Russia, and Tanzania; exact age depends on the deposit.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive decorative stone; occasionally used as aggregate or architectural stone. This specimen is more likely a common lapidary piece than gem-grade material.

Geological facts

Aventurine’s characteristic glitter, called aventurescence, comes from reflective inclusions; this piece shows only weak glitter, so it may also be green quartzite or low-grade aventurine.

Field identification & locations

Identify by testing for quartz-like hardness, lack of cleavage, granular texture, and green mica sparkle under strong light; glass usually has bubbles and a smoother fracture. Common rough and tumbled pieces are sold worldwide.