metamorphic

Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist

Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc

AI-generated identification · may be incorrect

Dark gray-green, fine-grained, weakly foliated, with a pale mineral vein; typically Mohs 2.5–4, dull to waxy luster, nonmetallic, and dense. Exact identification requires hardness, streak, magnetism, and acid testing.

Identified August 9, 2026More metamorphic →

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At a glance

Common name: Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist
Scientific name: Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc
Category: metamorphic
Identified: August 9, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a common tumbled specimen; $30–$100+ for unusually patterned, polished, or well-documented 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

Produced when mantle-derived peridotite is hydrated and metamorphosed, commonly along tectonic plate boundaries and ophiolite belts; formation may range from Paleozoic to modern tectonic settings.

Uses & applications

Used as decorative stone, carvings, countertops, aggregate, and lapidary material; attractive polished pieces may have modest collector value.

Geological facts

Serpentinite often contains fibrous minerals related to chrysotile and may weather to a characteristic green, slick surface. The light vein could be calcite, quartz, or chrysotile, requiring testing.

Field identification & locations

Likely serpentinite if it feels unusually soft, has a waxy surface, and scratches with a steel blade; chlorite schist is more likely if visibly foliated and harder. Common in California, the Appalachians, the Alps, New Zealand, and ophiolite complexes worldwide.