mineral

Polished green stone, likely chrysoprase or aventurine

Chrysoprase: microcrystalline chalcedony (SiO₂) colored by nickel; possible green aventurine: quartz (SiO₂) with fuchsite

AI-generated identification · may be incorrect

Tumbled and highly polished, translucent pale green with a darker earthy matrix. Quartz-group hardness is about Mohs 6.5–7, vitreous to waxy luster, with no visible cleavage and cryptocrystalline structure; exact identification requires testing.

Identified September 18, 2026More mineral →

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At a glance

Common name: Polished green stone, likely chrysoprase or aventurine
Scientific name: Chrysoprase: microcrystalline chalcedony (SiO₂) colored by nickel; possible green aventurine: quartz (SiO₂) with fuchsite
Category: mineral
Identified: September 18, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common tumbled piece; $30–$100+ if confirmed high-quality chrysoprase with vivid color and translucency.

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

Chrysoprase forms when nickel-rich fluids alter ultramafic rocks, while aventurine forms in quartz-rich metamorphic or hydrothermal settings; specimens commonly formed during relatively young weathering or hydrothermal episodes.

Uses & applications

Used for cabochons, beads, carvings, and ornamental stones; attractive polished pieces have modest jewelry and collecting value.

Geological facts

Chrysoprase is the rarest and most valued green chalcedony, historically used in jewelry and associated with Australian deposits. Aventurine commonly shows sparkling mica inclusions, which are not clearly visible here.

Field identification & locations

Common sources include Australia, Brazil, India, Madagascar, and the United States. A quartz hardness test, translucency, nickel-green color, and examination for mica sparkle or brown host-rock matrix help distinguish possibilities.