mineral

Polished black stone, likely labradorite or basalt

Possibly labradorite (plagioclase feldspar; NaAlSi₃O₈–CaAl₂Si₂O₈) or fine-grained basalt

AI-generated identification · may be incorrect

Dark gray-black, polished, with subdued blue-gray patches and a vitreous-to-waxy luster; apparent hardness about 6–7 Mohs. The visible pale linear feature may be a fracture or vein, and the image does not show diagnostic crystal structure.

Identified September 5, 2026More mineral →

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At a glance

Common name: Polished black stone, likely labradorite or basalt
Scientific name: Possibly labradorite (plagioclase feldspar; NaAlSi₃O₈–CaAl₂Si₂O₈) or fine-grained basalt
Category: mineral
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 as a small polished common specimen; higher-quality, strongly iridescent labradorite may sell for $30–$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

If labradorite, it crystallized in a mafic igneous rock from cooling magma, commonly during the Precambrian; if basalt, it formed from rapidly cooled lava. Exact identification requires testing for labradorescence, streak, density, and mineral texture.

Uses & applications

Polished labradorite is used in jewelry, carvings, and lapidary specimens; basalt is used mainly as aggregate, paving stone, and building material.

Geological facts

Labradorite can display strong spectral blue, green, or gold flashes when rotated under directional light. The specimen’s elongated, shaped form appears human-worked rather than naturally crystallized.

Field identification & locations

Look for iridescent flashes, feldspar cleavage, and hardness near 6–6.5 for labradorite; basalt is typically duller, fine-grained, and non-cleavable. Common sources include Madagascar, Finland, Canada, and Mexico, but this photo alone cannot distinguish them reliably.