igneous
Rounded granitic pebble
Granite, chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse crystalline, pale cream to gray with dark specks and possible pink feldspar; typically Mohs 6–7, vitreous to dull luster, no strong cleavage as a whole, and specific gravity about 2.6–2.7. Its smooth shape indicates water or glacial abrasion.
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Physical properties
Coarse crystalline, pale cream to gray with dark specks and possible pink feldspar; typically Mohs 6–7, vitreous to dull luster, no strong cleavage as a whole, and specific gravity about 2.6–2.7. Its smooth shape indicates water or glacial abrasion.
Formation & geological history
An intrusive igneous rock crystallized slowly from magma, commonly during Precambrian to Phanerozoic continental-crust formation; the specimen was later weathered and transported as a cobble.
Uses & applications
Used widely as building stone, aggregate, paving material, countertops, monuments, and landscaping rock; this rounded piece has mainly educational or modest collecting value.
Geological facts
Visible interlocking grains distinguish granite from sandstone and uniform quartzite, though the image cannot confirm the exact rock without a close grain view or tests.
Field identification & locations
Common in river gravels, beaches, glacial deposits, and exposed continental mountain belts worldwide; inspect for interlocking quartz/feldspar grains and test hardness with glass, noting acid usually produces no reaction.
