mineral

Tumbled dark stone, likely labradorite or serpentine

Likely labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈) or serpentine-group mineral

AI-generated identification · may be incorrect

Dark gray-green, rounded and polished, with pale bluish reflective patches; likely Mohs 4–6, vitreous to waxy luster, and no visible cleavage in the tumbled form. Identification is uncertain from the photograph alone.

Identified September 6, 2026More mineral →

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At a glance

Common name: Tumbled dark stone, likely labradorite or serpentine
Scientific name: Likely labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈) or serpentine-group mineral
Category: mineral
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a small common tumbled stone; $20–$75 if it displays strong, multicolored labradorescence.

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

Labradorite forms in mafic igneous rocks such as basalt and gabbro; serpentine forms by hydrothermal alteration of ultramafic rocks. Both are geologically ancient and occur in many Precambrian and younger terrains.

Uses & applications

Used as a cabochon, tumbled stone, ornamental material, and metaphysical collectible; labradorite is especially valued for blue-green schiller (labradorescence).

Geological facts

Strong blue flash under angled light would favor labradorite; a softer waxy appearance and green-black mottling would favor serpentine. The specimen appears human-tumbled and polished.

Field identification & locations

Common sources include Madagascar, Finland, Canada, Russia, and the United States for labradorite, while serpentine is widespread in ophiolite belts. Test carefully for hardness and inspect flashes under a focused light.