metamorphic

Weathered greenish metamorphic rock, possibly serpentinite

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

AI-generated identification · may be incorrect

Pale green to tan, dull-to-waxy luster, rounded and strongly weathered; typically hardness 2.5–4, specific gravity about 2.5–2.6, with poor or indistinct cleavage. The photograph lacks enough detail for a confident mineral identification.

Identified September 9, 2026More metamorphic →

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At a glance

Common name: Weathered greenish metamorphic rock, possibly serpentinite
Scientific name: Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)
Category: metamorphic
Identified: September 9, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common weathered fragment; attractive polished or well-formed specimens may sell for $20–$100.

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 hydrate during alteration by circulating fluids, commonly in ophiolites and subduction zones; ages range from Precambrian to modern tectonic settings.

Uses & applications

Used as decorative stone, carving material, aggregate, and historically as a source of asbestos-bearing material; ordinary fragments have little commercial value.

Geological facts

Serpentinite often has a characteristic greasy or waxy feel and may show mottled green veining. Chrysotile-bearing material should not be cut, sanded, or crushed because inhaled fibers are hazardous.

Field identification & locations

Common in California, Italy, New Zealand, Canada, and many ophiolite belts. A field test is a green waxy appearance and relatively low hardness, but confirmation requires streak, hardness, acid, or thin-section testing.