metamorphic

Greenstone / serpentinite-like metamorphic rock

Probable serpentinite-rich greenschist; commonly dominated by serpentine-group minerals, chlorite, actinolite, and magnetite

AI-generated identification · may be incorrect

Dark green, mottled, and dull to slightly waxy with a fine-grained texture; approximate Mohs hardness 2.5–5.5, depending on mineral mixture. No clear crystals or cleavage are visible; likely dense and relatively heavy.

Identified September 20, 2026More metamorphic →

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At a glance

Common name: Greenstone / serpentinite-like metamorphic rock
Scientific name: Probable serpentinite-rich greenschist; commonly dominated by serpentine-group minerals, chlorite, actinolite, and magnetite
Category: metamorphic
Identified: September 20, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$100+ if polished, unusually patterned, or confirmed as a desirable variety.

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

Formed when ultramafic mantle rock was hydrated and metamorphosed during tectonic activity, commonly in ophiolites and subduction zones. Exact geological age cannot be determined from the photograph.

Uses & applications

Used as ornamental stone, carving material, landscaping rock, and occasionally jewelry; attractive specimens have modest collector value.

Geological facts

The appearance is consistent with serpentinite or a related greenstone, but image-only identification is uncertain; some green metamorphic rocks are chlorite schist or altered basalt.

Field identification & locations

Common in tectonically active mountain belts and ophiolite complexes, including California, Oregon, Italy, New Zealand, and the Alps. Field clues include green mottling, a waxy surface, curved fractures, and possible magnetism; avoid dust because some serpentinite can contain asbestos-forming minerals.