mineral

Polished pale-green stone, likely serpentine or green aventurine

Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich aventurine

AI-generated identification · may be incorrect

Smooth, rounded, opaque pale gray-green with a waxy to satin luster and faint bands. Serpentine hardness is about 2.5–4 Mohs; aventurine is harder, about 6.5–7, so an image alone cannot distinguish them reliably.

Identified August 26, 2026More mineral →

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At a glance

Common name: Polished pale-green stone, likely serpentine or green aventurine
Scientific name: Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich aventurine
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

$2–$15 for a common polished/tumbled piece; $20–$75 if unusually attractive, large, or confirmed as quality material.

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

Serpentine forms when ultramafic mantle rocks hydrothermally alter, commonly during tectonic activity; deposits range from ancient Precambrian to modern geological settings. Green aventurine forms when quartz-rich rocks crystallize with dispersed mica or fuchsite.

Uses & applications

Used as a tumbled stone, carving material, ornamental stone, and occasionally jewelry; serpentine is also used decoratively in tiles and countertops. Typical value is modest unless unusually patterned or gem quality.

Geological facts

Likely identification requires hardness, streak, and magnification tests; the uniform polish obscures diagnostic texture. Serpentine commonly has a greasy or waxy feel and may show fibrous veining.

Field identification & locations

Common sources include California, Vermont, Italy, New Zealand, Canada, and Afghanistan; aventurine is notably associated with India, Brazil, and Russia. Check hardness against glass and inspect for mica sparkle or fibrous veining, avoiding destructive tests on valuable pieces.