igneous
Granite pebble
Granitic rock, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray to pink, with visible interlocking mineral grains and dull-to-glassy luster; typical hardness is about 6–7 Mohs, with no consistent cleavage as a whole. The rounded shape indicates natural water or abrasion wear.
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Physical properties
Coarse-grained, pale gray to pink, with visible interlocking mineral grains and dull-to-glassy luster; typical hardness is about 6–7 Mohs, with no consistent cleavage as a whole. The rounded shape indicates natural water or abrasion wear.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic continental crust formation; later weathering produced the pebble. Exact age and source cannot be determined from the photograph.
Uses & applications
Used extensively as building stone, aggregate, paving material, countertops, monuments, and landscaping rock; this small specimen has little jewelry value.
Geological facts
The light minerals are likely quartz and feldspar, while darker flecks may be biotite or hornblende. Color and grain size vary substantially among granites.
Field identification & locations
Common worldwide, especially in continental mountain belts and exposed batholiths. Confirm by checking for hard, glassy quartz grains, blocky feldspar, and resistance to scratching; a thin-section or chemical test is needed for certainty.
