igneous

Weathered granite or granitic gneiss pebble

Granite, primarily quartz, feldspar, and mica; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Light gray, fine- to medium-grained, with faint darker mineral flecks and a dull weathered luster; likely hardness 6–7 Mohs, massive or weakly foliated, with no obvious cleavage as a whole rock.

Identified August 15, 2026More igneous →

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At a glance

Common name: Weathered granite or granitic gneiss pebble
Scientific name: Granite, primarily quartz, feldspar, and mica; exact identification is uncertain from the image
Category: igneous
Identified: August 15, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary pebble; up to about $10–$30 if attractively patterned, locality-labeled, or part of a teaching collection.

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

Light gray, fine- to medium-grained, with faint darker mineral flecks and a dull weathered luster; likely hardness 6–7 Mohs, massive or weakly foliated, with no obvious cleavage as a whole rock.

Formation & geological history

Likely formed by slow crystallization of silica-rich magma deep in the crust, commonly during Precambrian to younger continental tectonic events, then exposed and rounded by weathering and transport.

Uses & applications

Common granitic material is used as crushed aggregate, dimension stone, pavers, and monuments; this small specimen has mainly educational or modest collecting value.

Geological facts

The pale grains are probably feldspar and quartz, while darker specks may be biotite or amphibole. The subtle banding could indicate gneiss rather than ordinary granite.

Field identification & locations

Look for interlocking visible grains, abundant pale feldspar/quartz, and scattered dark mica; a fresh broken surface, streak, and hand lens would improve identification. Granitic rocks occur widely on continental shields and mountain belts worldwide.