igneous
Granite Pebble
Granite (felsic intrusive igneous rock)
Hardness ~6-7 on Mohs scale. Phaneritic (coarse-grained) texture featuring pinkish potassium feldspar, translucent quartz, and dark biotite or hornblende inclusions. Dull to sub-vitreous luster.
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Physical properties
Hardness ~6-7 on Mohs scale. Phaneritic (coarse-grained) texture featuring pinkish potassium feldspar, translucent quartz, and dark biotite or hornblende inclusions. Dull to sub-vitreous luster.
Formation & geological history
Formed from the slow crystallization of magma beneath Earth's surface deep within continental crust. Later eroded, weathered, and rounded by water or glacial action.
Uses & applications
Used widely in construction, dimension stone, counter tops, road base, aggregate, and as a common educational rock specimen.
Geological facts
Granite makes up a major portion of Earth's continental crust. Over geological time, weathered granite pebbles are transported by rivers and glaciers, smoothing their edges.
Field identification & locations
Identified in the field by its distinct speckling ('salt-and-pepper' appearance) with visible interlocking pink/white feldspar and gray quartz grains. Abundant worldwide.
