igneous
Granite Pebble
Granite (Plutonic Igneous Rock)
Hardness 6-7 on Mohs scale; phaneritic coarse-grained texture; vitreous to dull luster; color mix of salmon-pink (orthoclase feldspar), white/gray translucent (quartz), and black/dark spots (biotite mica or amphibole).
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Physical properties
Hardness 6-7 on Mohs scale; phaneritic coarse-grained texture; vitreous to dull luster; color mix of salmon-pink (orthoclase feldspar), white/gray translucent (quartz), and black/dark spots (biotite mica or amphibole).
Formation & geological history
Formed from the slow crystallization of felsic magma deep beneath the Earth's surface (plutonic formation). This small pebble has been rounded and eroded over time by water or beach action.
Uses & applications
Dimension stone, crushed stone for construction, road base, counter tops, decorative gravel, and landscape design.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Over time, erosion exposes these deep plutonic rocks, breaking them down into river and beach pebbles like this one.
Field identification & locations
Identified by its visible interlocking crystals of pink feldspar, clear quartz, and dark mica/amphibole. Found worldwide along beaches, rivers, glacial deposits, and mountain ranges.
