igneous
Granite or granitic pebble
Granite; primarily quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, mottled gray-white rock with visible interlocking crystals; quartz hardness ~7, feldspar ~6, vitreous to dull luster, no prominent cleavage as a whole, and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, mottled gray-white rock with visible interlocking crystals; quartz hardness ~7, feldspar ~6, vitreous to dull luster, no prominent cleavage as a whole, and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep underground, generally during Precambrian to Phanerozoic continental mountain-building. The rounded shape indicates later weathering and stream transport.
Uses & applications
Commonly used as dimension stone, countertops, paving, monuments, aggregate, and landscaping stone; this small rounded specimen has mainly educational or collecting value.
Geological facts
The image suggests granite, but lighting and resolution prevent firm separation from granodiorite or gneiss. Its “salt-and-pepper” appearance reflects contrasting light feldspar/quartz and dark mica or amphibole.
Field identification & locations
Identify it by visible interlocking crystals and a hard, speckled texture; it should scratch glass but not a steel knife easily. Common in continental uplands and stream gravels worldwide; a thin section or hand lens can confirm mineral proportions.
