metamorphic

Polished bronzite-bearing serpentine (probable)

Serpentinite, chiefly serpentine-group minerals with bronzite/orthopyroxene and magnetite inclusions

AI-generated identification · may be incorrect

Hardness about 3–6 Mohs depending on composition; olive-green to brown-black mottling, waxy to glassy polish, opaque, with no obvious cleavage. The reflective golden-brown patches may be bronzite or iron-rich serpentine; image-based identification is provisional.

Identified September 22, 2026More metamorphic →

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At a glance

Common name: Polished bronzite-bearing serpentine (probable)
Scientific name: Serpentinite, chiefly serpentine-group minerals with bronzite/orthopyroxene and magnetite inclusions
Category: metamorphic
Identified: September 22, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a typical polished palm stone; $50–$150 for unusually attractive, large, or well-finished specimens.

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 ultramafic mantle rocks such as peridotite hydrate during low-temperature metamorphism, commonly in subduction zones; ages vary from Precambrian to modern tectonic belts.

Uses & applications

Used as decorative stone, carvings, cabochons, countertops, and ornamental objects; polished pieces are mainly collectible rather than highly valuable gemstones.

Geological facts

Serpentinite commonly contains magnetite, producing dark specks and occasional magnetic response; bronzite gives bronze-gold flashes and may cause confusion with tiger’s-eye or pietersite.

Field identification & locations

Identify by its green-brown mottled appearance, relatively soft waxy surface, and possible magnetism; distinguish from jasper or glass with a hardness test and close inspection. Common in ophiolites and ultramafic mountain belts worldwide.