metamorphic

Small rounded, foliated metamorphic pebble (likely greenschist)

Greenschist, commonly composed of chlorite, actinolite, and albite; exact identification requires testing

AI-generated identification · may be incorrect

Fine-grained, gray-green, and weakly foliated with a dull to slightly satiny luster. Likely hardness about 4–6 Mohs; crystal structure and cleavage are not distinguishable from the photo.

Identified October 8, 2026More metamorphic →

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At a glance

Common name: Small rounded, foliated metamorphic pebble (likely greenschist)
Scientific name: Greenschist, commonly composed of chlorite, actinolite, and albite; exact identification requires testing
Category: metamorphic
Identified: October 8, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common small pebble; more if its locality or mineralogy is documented.

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

Fine-grained, gray-green, and weakly foliated with a dull to slightly satiny luster. Likely hardness about 4–6 Mohs; crystal structure and cleavage are not distinguishable from the photo.

Formation & geological history

Formed when mafic volcanic rocks or sediments were altered by heat, pressure, and fluids during low-grade metamorphism. Its age and source cannot be determined visually; rounding suggests transport by water or glacial action.

Uses & applications

Small specimens are mainly used for teaching and collecting; related metamorphic stone may be used decoratively or as aggregate.

Geological facts

Green color in greenschist commonly comes from chlorite and actinolite, but color alone is not diagnostic.

Field identification & locations

Look for fine aligned green minerals and a foliated texture; similar pebbles occur in metamorphic terrains and stream or beach deposits. A hand lens and hardness/cleavage tests would help confirm identification.