mineral

Polished green stone, likely aventurine or jade

Most likely green aventurine quartz (SiO₂) or nephrite jade (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); image alone cannot distinguish them

AI-generated identification · may be incorrect

Small rounded, polished, opaque green specimen with vitreous-to-waxy luster; aventurine has Mohs hardness 6.5–7, while nephrite is 6–6.5 and notably tough. No visible cleavage or crystal faces.

Identified August 30, 2026More mineral →

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At a glance

Common name: Polished green stone, likely aventurine or jade
Scientific name: Most likely green aventurine quartz (SiO₂) or nephrite jade (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); image alone cannot distinguish them
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small polished aventurine piece; approximately $5–$50+ if confirmed as attractive nephrite jade, with exceptional jade far higher.

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

Small rounded, polished, opaque green specimen with vitreous-to-waxy luster; aventurine has Mohs hardness 6.5–7, while nephrite is 6–6.5 and notably tough. No visible cleavage or crystal faces.

Formation & geological history

Green aventurine forms when quartz crystallizes with fuchsite mica, commonly in metamorphic rocks; nephrite forms through metamorphism and metasomatism of ultramafic or dolomitic rocks. Both are ancient natural geological materials, but age depends on locality.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive jewelry; jade-quality material can be substantially more valuable than aventurine.

Geological facts

Aventurine often shows glittery aventurescence from mica, though none is obvious here. Nephrite is prized for exceptional toughness rather than high hardness.

Field identification & locations

Check for subtle mica sparkle, translucent quartz-like edges, and hardness; reliable identification requires a scratch, specific-gravity, or gemological test. Green aventurine is common in India, Brazil, Russia, and China; nephrite occurs in China, New Zealand, Canada, and Russia.