igneous
Granite pebble
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectA coarse-grained, speckled gray-white rock with visible interlocking crystals and moderate-to-high luster. Hardness is approximately 6–7 Mohs; cleavage occurs in feldspar, while quartz has none; specific gravity is about 2.63–2.75.
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Physical properties
A coarse-grained, speckled gray-white rock with visible interlocking crystals and moderate-to-high luster. Hardness is approximately 6–7 Mohs; cleavage occurs in feldspar, while quartz has none; specific gravity is about 2.63–2.75.
Formation & geological history
Granite forms when silica-rich magma cools slowly deep within continental crust, allowing large crystals to develop. Individual specimens may range from Precambrian to Phanerozoic age and are commonly released by weathering or erosion.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and decorative stone. Small rounded pieces are mainly used for collecting or landscaping.
Geological facts
The rounded shape indicates transport by water, ice, or prolonged weathering. Its salt-and-pepper appearance reflects contrasting light feldspar/quartz and dark biotite or amphibole.
Field identification & locations
Identify it by visible interlocking crystals, gray-pink-white color, and a lack of layering or foliation; a steel knife generally cannot scratch it. Common worldwide in continental mountain belts, especially shield regions and granitic terrains.
