metamorphic

Likely dark green jasper or serpentinite pebble

Undetermined fine-grained rock; possible serpentine-group mineral (approx. Mg₃Si₂O₅(OH)₄) or jasper (microcrystalline SiO₂)

AI-generated identification · may be incorrect

Small, dark green to black, opaque pebble with a dull-to-slightly-waxy surface; grain size and hardness cannot be determined from the image. Identification is uncertain without close-up inspection or testing.

Identified September 25, 2026More metamorphic →

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At a glance

Common name: Likely dark green jasper or serpentinite pebble
Scientific name: Undetermined fine-grained rock; possible serpentine-group mineral (approx. Mg₃Si₂O₅(OH)₄) or jasper (microcrystalline SiO₂)
Category: metamorphic
Identified: September 25, 2026
Method: Standard

AI Estimated Value

About $0–$5 as an unidentified small pebble; higher value would require confirmed identity and notable 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

If serpentinite, it formed through hydration and alteration of ultramafic rocks; if jasper, it is silica-rich microcrystalline quartz deposited and later lithified. No age or locality can be inferred from the photo.

Uses & applications

Comparable material is used for ornaments, beads, carvings, and geological collections; this small specimen has no evident commercial use.

Geological facts

Green color alone is not diagnostic: many minerals and rocks can appear green, and a wet or polished surface may alter their appearance.

Field identification & locations

A magnified view showing texture, plus hardness, streak, and specific-gravity tests, would help distinguish jasper from serpentinite and other green stones. Common sources depend on the actual identification.