mineral
Polished gray stone, likely labradorite or gneiss
Indeterminate from image; possibly plagioclase-rich gneiss or labradorite-bearing rock
AI-generated identification · may be incorrectSmooth, 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.
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Physical properties
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.
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.
