igneous
Rounded granite or granitic gneiss pebble
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse, granular, pale gray-beige rock with visible quartz/feldspar grains and minor dark mica; typical hardness is 6–7 Mohs, with vitreous quartz luster and no prominent cleavage as a whole. The rounded shape indicates abrasion, likely in gravel or stream transport.
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Physical properties
Coarse, granular, pale gray-beige rock with visible quartz/feldspar grains and minor dark mica; typical hardness is 6–7 Mohs, with vitreous quartz luster and no prominent cleavage as a whole. The rounded shape indicates abrasion, likely in gravel or stream transport.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep underground, commonly during Precambrian to younger continental crust formation; surface rounding occurred later through weathering and transport.
Uses & applications
Commonly used as aggregate, road base, landscaping stone, paving, and building or countertop material when sound and attractive; this ordinary pebble has little jewelry value.
Geological facts
Granite is an intrusive igneous rock, while a foliated equivalent could be granitic gneiss; the image does not show enough texture to distinguish them confidently.
Field identification & locations
Identify it by interlocking light quartz/feldspar grains, scattered dark mica, high hardness, and lack of layering or fossils. Common worldwide, especially in continental mountain and shield regions; a fresh broken surface is more diagnostic than the weathered exterior.
