metamorphic

Green serpentine pebble (possibly serpentine-rich rock)

Serpentinite, composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile; exact identification requires testing

AI-generated identification · may be incorrect

Green, mottled, and apparently polished or naturally rounded, with a waxy to greasy luster. Serpentine minerals are typically Mohs 2.5–4 and have a fine-grained structure; cleavage is usually not visible in a small pebble. The image alone cannot establish hardness or specific gravity.

Identified October 14, 2026More metamorphic →

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At a glance

Common name: Green serpentine pebble (possibly serpentine-rich rock)
Scientific name: Serpentinite, composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile; exact identification requires testing
Category: metamorphic
Identified: October 14, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small common pebble; more if verified, unusually patterned, or crafted.

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 water alters ultramafic rocks, commonly at or near tectonic plate boundaries; the age varies with the host rock and alteration event.

Uses & applications

Serpentinite is used as decorative stone, carvings, and jewelry; some varieties have been used as building stone. Avoid handling or cutting unidentified fibrous material because chrysotile asbestos may be present.

Geological facts

Serpentine is a mineral group, not one single mineral, and its distinctive green color comes from iron and other trace elements.

Field identification & locations

A smooth green surface and mottled pattern are suggestive but not diagnostic; confirm by hardness, streak, and mineralogical testing. Serpentinite occurs in ophiolites and other ultramafic terranes worldwide.