metamorphic

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with magnetite and chlorite

AI-generated identification · may be incorrect

Small dark green-gray, fine-grained, weakly lustrous specimen with a mottled texture. Serpentine has Mohs hardness about 2.5–4, no consistent cleavage, and commonly forms compact or waxy masses; the photo alone cannot confirm exact mineralogy.

Identified September 17, 2026More metamorphic →

Explore Likely serpentine-rich metamorphic rock in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Likely serpentine-rich metamorphic rock
Scientific name: Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with magnetite and chlorite
Category: metamorphic
Identified: September 17, 2026
Method: Standard

AI Estimated Value

Approximately $1–$15 for a small common fragment; $20–$100+ for polished, patterned, or locality-labeled 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 are hydrated and metamorphosed, commonly along oceanic crust and tectonic plate boundaries. Serpentinization ranges from ancient Precambrian events to modern seafloor alteration.

Uses & applications

Used as ornamental stone, carvings, architectural stone, and historically as a source of asbestos minerals; attractive pieces are collected, though fibrous varieties should not be cut or powdered.

Geological facts

Often shows dark green to black color, slick or waxy surfaces, and may attract a magnet if magnetite is abundant. It can be confused with greenstone, jade, or chlorite-rich rocks.

Field identification & locations

Common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide; test cautiously for softness and waxy texture, but laboratory testing is needed for reliable identification and asbestos screening.