igneous
Granite Pebble
Granite
Phaneritic texture, visible interlocking grains of pink/beige potassium feldspar, translucent quartz, and dark mafic minerals like biotite or hornblende. Hardness 6 to 7 on Mohs scale, vitreous to dull luster, specific gravity ~2.65-2.75.
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Physical properties
Phaneritic texture, visible interlocking grains of pink/beige potassium feldspar, translucent quartz, and dark mafic minerals like biotite or hornblende. Hardness 6 to 7 on Mohs scale, vitreous to dull luster, specific gravity ~2.65-2.75.
Formation & geological history
Formed by the slow cooling and crystallization of silica-rich magma deep underground in plutonic environments. The rounded shape indicates secondary mechanical weathering and transport by river or wave action.
Uses & applications
Commonly used as construction aggregate, dimension stone, decorative landscaping stone, and as educational geology specimens.
Geological facts
Granite makes up the majority of the Earth's continental crust. Over millions of years, glacial movement and water transport grind sharp granite fragments into smooth, rounded beach or river pebbles like this one.
Field identification & locations
Identified by its speckled 'salt-and-pepper' appearance containing distinct quartz and feldspar grains. Very widespread along ocean beaches, riverbeds, and glacial till deposits globally.
