igneous
Rounded granite pebble
Granite, chiefly quartz–feldspar–mica; exact variety uncertain from the image
AI-generated identification · may be incorrectCoarse-grained, speckled light gray rock with black and pale mineral grains, weak vitreous to dull luster, and no obvious cleavage as a whole. Typical granite hardness is about Mohs 6–7 and specific gravity 2.63–2.75.
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Physical properties
Coarse-grained, speckled light gray rock with black and pale mineral grains, weak vitreous to dull luster, and no obvious cleavage as a whole. Typical granite hardness is about Mohs 6–7 and specific gravity 2.63–2.75.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic episodes; erosion and stream or beach transport rounded this specimen.
Uses & applications
Used widely as dimension stone, countertops, monuments, crushed aggregate, and decorative landscaping stone; this small pebble has mainly educational or modest collecting value.
Geological facts
The pale grains are likely feldspar and quartz, while dark grains are commonly biotite or hornblende. A hand lens and streak-free hardness testing help distinguish it from similarly colored gneiss or diorite.
Field identification & locations
Common worldwide, especially in granitic terrains and glacial or river gravels. Identify it by its interlocking visible grains and mottled texture; acid reaction should be absent unless carbonate contamination is present.
