igneous
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
Hardness of 6 on the Mohs scale, colors range from pink to gray depending on feldspar content, dull to glassy luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65 to 2.75.
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Physical properties
Hardness of 6 on the Mohs scale, colors range from pink to gray depending on feldspar content, dull to glassy luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling of magma rich in silica and alkali metal oxides beneath the Earth's surface over millions of years.
Uses & applications
Widely used in construction for countertops, floor tiles, curbing, monuments, and building facades.
Geological facts
Granite is the most common rock of the Earth's continental crust and is exceptionally durable against weathering.
Field identification & locations
Easily identified in the field by its visible interlocking mineral grains (quartz, feldspar, and mica). Found globally in continental shields and mountain belts.
