igneous
Rounded weathered pebble, likely granite or granitic gneiss
Probable granitoid: quartz, feldspar, and dark mica/amphibole
AI-generated identification · may be incorrectGray-brown, fine-to-medium granular texture with subdued vitreous to earthy luster; likely Mohs hardness 6–7, no obvious cleavage, and specific gravity about 2.6–2.8. Its smooth shape reflects abrasion and weathering rather than crystal growth.
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Physical properties
Gray-brown, fine-to-medium granular texture with subdued vitreous to earthy luster; likely Mohs hardness 6–7, no obvious cleavage, and specific gravity about 2.6–2.8. Its smooth shape reflects abrasion and weathering rather than crystal growth.
Formation & geological history
Probably eroded from an igneous or metamorphic outcrop and rounded by a stream, beach, or glacial transport. Its minerals formed during crystallization of silica-rich magma, generally in Precambrian to younger continental crust.
Uses & applications
Commonly used as landscaping or decorative stone, aquarium gravel, craft material, and aggregate; this individual pebble has little commercial value.
Geological facts
The image is insufficient for confident species-level identification because grain size and mineral boundaries are indistinct. A streak test, hardness test, and close inspection with a hand lens would improve identification.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, dark mica flakes, and possible pink or white feldspar; granite is nonreactive to dilute acid. Common worldwide, especially in riverbeds, beaches, glacial deposits, and granite terrains.
