igneous
Granite fragment
Granite, composed mainly of quartz, potassium feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-white-black appearance with vitreous quartz and feldspar luster; Mohs hardness about 6–7, massive texture, and no prominent cleavage as a whole rock.
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Physical properties
Coarse-grained, speckled gray-white-black appearance with vitreous quartz and feldspar luster; Mohs hardness about 6–7, massive texture, and no prominent cleavage as a whole rock.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; this small fragment has negligible commercial value.
Geological facts
The visible interlocking crystals indicate slow underground cooling rather than volcanic eruption. Dark grains are likely biotite or amphibole, while translucent grains are quartz.
Field identification & locations
Identify it by its visible interlocking crystals and three-color pattern; unlike basalt, it is light-colored and coarse-grained. Common worldwide in continental crust and granite quarries.
