igneous
Tumbled granite pebble
Granite, a quartz–feldspar–mica plutonic rock
AI-generated identification · may be incorrectCoarse-grained, mottled white, gray, pink, and black; interlocking crystals with glassy quartz, feldspar, and dark mica. Hardness is approximately 6–7 Mohs, with low porosity and no strong cleavage as a whole.
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Physical properties
Coarse-grained, mottled white, gray, pink, and black; interlocking crystals with glassy quartz, feldspar, and dark mica. Hardness is approximately 6–7 Mohs, with low porosity and no strong cleavage as a whole.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to younger mountain-building events; this piece has been naturally or mechanically rounded and polished.
Uses & applications
Used widely as building stone, countertops, monuments, aggregate, landscaping rock, and inexpensive polished specimens.
Geological facts
The visible black flakes are likely biotite or hornblende, while pale grains are feldspar and quartz. Its speckled texture reflects slow underground cooling rather than volcanic eruption.
Field identification & locations
Identify it by its coarse interlocking grains, pink/white feldspar, translucent gray quartz, and black mica; common worldwide, especially in continental shields and mountain belts. Exact mineral proportions cannot be confirmed from the photograph.
