igneous
Pink granite pebble
Granite, composed chiefly of quartz, potassium feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pinkish tan with visible interlocking crystals and a granular, nonmetallic luster. Typical Mohs hardness is 6–7; minerals have distinct cleavage, but the rock itself has no cleavage.
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Physical properties
Coarse-grained, pinkish tan with visible interlocking crystals and a granular, nonmetallic luster. Typical Mohs hardness is 6–7; minerals have distinct cleavage, but the rock itself has no cleavage.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing large crystals to grow. Granite occurs in ancient continental crust, often billions of years old; this pebble was likely rounded by transport and abrasion.
Uses & applications
Granite is widely used for building stone, paving, countertops, monuments, and landscaping; small rounded specimens are mainly decorative or collectible.
Geological facts
The pink color commonly comes from potassium feldspar, while glassy gray grains are usually quartz and dark flecks are mica or amphibole.
Field identification & locations
Look for interlocking pink, gray, and dark mineral grains rather than layers or fossils; granite is common in continental mountain belts and glacial or river gravels. The image suggests granite, though a photograph cannot confirm its mineral composition.
