igneous
Polished granite pebble
Granite; chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, speckled pink, white, gray, and black appearance with a polished luster; typical hardness is about 6–7 Mohs, massive structure, and no cleavage as a whole rock. The rounded shape and shine indicate tumbling or natural water-wearing.
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Physical properties
Coarse-grained, speckled pink, white, gray, and black appearance with a polished luster; typical hardness is about 6–7 Mohs, massive structure, and no cleavage as a whole rock. The rounded shape and shine indicate tumbling or natural water-wearing.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to younger intrusive events. Weathering and erosion later produce rounded pebbles suitable for polishing.
Uses & applications
Used as a decorative stone, countertop and building material, landscaping gravel, and inexpensive lapidary specimens. This small polished piece has mainly educational or display value.
Geological facts
Pink areas are likely potassium feldspar, translucent gray grains are quartz, and dark grains are biotite mica or amphibole. Individual minerals may show cleavage even though the rock mass does not.
Field identification & locations
Identify it by visible interlocking crystals and the quartz–feldspar–dark-mineral combination; it should not fizz with dilute acid. Common sources include continental mountain belts and glacial or river gravels worldwide.
