igneous
Granite Pebble
Intrusive Igneous Rock (composed of quartz, feldspar, and mica)
Hardness of 6-7 on the Mohs scale, mottled black and white/grey coloration, vitreous to dull luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65-2.75.
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Physical properties
Hardness of 6-7 on the Mohs scale, mottled black and white/grey coloration, vitreous to dull luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65-2.75.
Formation & geological history
Formed by the slow cooling of magma beneath the Earth's surface, often dating from Precambrian to Cenozoic eras, subsequently weathered and tumbled into a smooth pebble by water transport.
Uses & applications
Used in landscaping, decorative stone, and gravel.
Geological facts
Granite is the most common intrusive rock of Earth's continental crust and is exceptionally durable against weathering.
Field identification & locations
Easily identified by its speckled appearance showing interlocking crystals of quartz and feldspar; commonly found in stream beds and beaches worldwide.
