igneous
Rounded granite pebble
Granite, a quartz–feldspar–mica plutonic rock
AI-generated identification · may be incorrectPale gray-white with scattered dark mineral grains and a fine-to-medium granular texture; minerals typically have Mohs hardness 6–7, vitreous to dull luster, and interlocking crystals. The pebble’s smooth, oval shape results from abrasion; exact mineral proportions cannot be confirmed from the image.
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Physical properties
Pale gray-white with scattered dark mineral grains and a fine-to-medium granular texture; minerals typically have Mohs hardness 6–7, vitreous to dull luster, and interlocking crystals. The pebble’s smooth, oval shape results from abrasion; exact mineral proportions cannot be confirmed from the image.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in the crust, commonly in ancient continental plutons. The pebble was later weathered and rounded by water or glacial transport; its geological age cannot be determined visually.
Uses & applications
Granite is widely used as dimension stone, paving, crushed aggregate, and countertops; this small pebble is mainly suitable for collecting or decoration.
Geological facts
Typical granite contains quartz, potassium feldspar, plagioclase, and minor biotite or other dark minerals.
Field identification & locations
Look for a speckled, interlocking mix of light minerals and dark grains, rather than layers or vesicles. Granite pebbles occur in river and beach gravels and glacial deposits worldwide.
