mineral

Polished gray stone, likely labradorite or gneiss

Indeterminate from image; possibly plagioclase-rich gneiss or labradorite-bearing rock

AI-generated identification · may be incorrect

Smooth, rounded/polished pebble with gray-brown coloration, subtle darker veining, and a dull to weakly vitreous luster. Hardness is probably about Mohs 6–7; cleavage and specific gravity cannot be confirmed visually.

Identified September 9, 2026More mineral →

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At a glance

Common name: Polished gray stone, likely labradorite or gneiss
Scientific name: Indeterminate from image; possibly plagioclase-rich gneiss or labradorite-bearing rock
Category: mineral
Identified: September 9, 2026
Method: Standard

AI Estimated Value

$1–$10 as a common polished pebble; approximately $10–$50 if it displays attractive labradorescence or distinctive patterning.

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 gneiss, it formed by high-grade metamorphism of an original igneous or sedimentary rock; if labradorite-rich, it crystallized in a mafic igneous body. Geological age and locality cannot be determined from the photograph.

Uses & applications

Commonly used as a decorative pebble, cabochon, or lapidary specimen; gneiss is also used locally as aggregate and dimension stone. Value is usually modest unless strong labradorescence or attractive patterning is present.

Geological facts

The image does not show diagnostic crystal faces or clear optical flash, so a precise identification is not reliable. A flashlight moved across the surface may reveal blue-green labradorescence if labradorite is present.

Field identification & locations

Field identification requires a hardness test, streak, density, and inspection of fresh or magnified surfaces; gray gneiss commonly shows banding, while labradorite shows iridescent flash. Common sources include metamorphic terrains and mafic igneous provinces worldwide.