igneous
Granite Pebble
Granite
Mohs hardness of 6 to 7; typically pink, white, or gray with dark mineral flecks; vitreous to dull luster; phaneritic (coarse-grained) crystal structure; specific gravity around 2.65 to 2.75.
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Physical properties
Mohs hardness of 6 to 7; typically pink, white, or gray with dark mineral flecks; vitreous to dull luster; phaneritic (coarse-grained) crystal structure; specific gravity around 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma rich in silica and alkali metals far beneath the Earth's surface over millions of years.
Uses & applications
Used in construction, monuments, paving, countertops, and decorative aggregates.
Geological facts
Granite is the most common intrusive igneous rock in the Earth's continental crust and forms the core of many major mountain ranges.
Field identification & locations
Easily identified by its visible interlocking crystals of quartz, feldspar, and mica. Commonly found in stream beds and glacial till as weathered pebbles.
