igneous
Granite Pebble
Intrusive Igneous Rock
Hardness of 6 on the Mohs scale; mottled gray, white, and black coloration; vitreous to dull luster; phaneritic crystal structure with visible quartz, feldspar, and biotite grains; specific gravity around 2.65 to 2.75.
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Physical properties
Hardness of 6 on the Mohs scale; mottled gray, white, and black coloration; vitreous to dull luster; phaneritic crystal structure with visible quartz, feldspar, and biotite grains; specific gravity around 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma deep beneath the Earth's surface, typically originating in continental crustal environments over millions of years.
Uses & applications
Used widely in construction, dimension stone, monuments, countertops, and as crushed aggregate in civil engineering projects.
Geological facts
Granite is the most common intrusive rock in the Earth's continental crust and forms the major framework of many mountain ranges.
Field identification & locations
Easily identified in the field by its interlocking, visible mineral crystals of quartz (glassy), feldspar (pink or white blocks), and dark mica or amphibole flakes.
