metamorphic

Serpentine-rich greenstone (probable serpentine/soapstone fragment)

Serpentine-group minerals, chiefly antigorite/lizardite; possibly minor talc, chlorite, and carbonate

AI-generated identification · may be incorrect

Hardness about 2.5–4 Mohs, mottled olive-green to yellow-green, waxy to greasy luster, opaque, massive and noncleavable to weakly cleaved; specific gravity roughly 2.5–2.6. The small specimen appears naturally fractured or roughly trimmed, with pale green translucent patches and rusty staining.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Serpentine-rich greenstone (probable serpentine/soapstone fragment)
Scientific name: Serpentine-group minerals, chiefly antigorite/lizardite; possibly minor talc, chlorite, and carbonate
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a small common fragment; $20–$100+ for attractive polished 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 rocks such as peridotite are hydrated during low- to moderate-temperature metamorphism; commonly associated with faults and ancient oceanic crust, often Paleozoic to Precambrian in age.

Uses & applications

Used decoratively as carving stone, architectural serpentine (“verde antique”), and occasionally in jewelry; small rough fragments have modest collecting value.

Geological facts

Serpentine is a mineral group rather than one single mineral, and its green color results from iron and crystal-structure variations. Some serpentinites may contain chrysotile asbestos, so avoid cutting, grinding, or creating dust.

Field identification & locations

Identify by its soft, waxy feel, mottled green color, low hardness, and association with dark ultramafic rock; common localities include California, Italy, Canada, New Zealand, and the Appalachians. Exact identification would require hardness, streak, and mineralogical testing.