metamorphic

Greenstone (likely serpentine-rich rock)

Serpentinite, a rock composed mainly of serpentine-group minerals; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Small rounded, pale green specimen with irregular dark patches and a dull to slightly waxy appearance. Serpentine minerals have Mohs hardness about 2.5–5.5 and a fine-grained, commonly massive texture; crystal structure and specific gravity cannot be determined visually here.

Identified September 26, 2026More metamorphic →

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At a glance

Common name: Greenstone (likely serpentine-rich rock)
Scientific name: Serpentinite, a rock composed mainly of serpentine-group minerals; exact identification is uncertain from the image
Category: metamorphic
Identified: September 26, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small, common loose specimen; value depends on confirmed identification, locality, and quality.

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

Serpentinite forms when water alters magnesium-rich mantle rocks, commonly along tectonic plate boundaries and faults. This process has occurred throughout Earth’s history; the specimen’s age and locality cannot be inferred from the image.

Uses & applications

Serpentinite and related greenstones are used as decorative or carving stone and as collectors’ specimens; some varieties have been used in building stone.

Geological facts

The mottled green-and-black appearance is consistent with serpentine-bearing material, but several other rocks and minerals can look similar at this scale.

Field identification & locations

A green body with a waxy feel and relatively low hardness can suggest serpentine; confirm by testing hardness and streak, ideally with expert examination. Serpentinite occurs in many mountain belts worldwide.