igneous
Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
Hardness of 6-7 on the Mohs scale, mottled gray, pink, or white color with visible interlocking mineral grains, dull to vitreous luster, massive crystal structure, specific gravity around 2.65 - 2.75.
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Physical properties
Hardness of 6-7 on the Mohs scale, mottled gray, pink, or white color with visible interlocking mineral grains, dull to vitreous luster, massive crystal structure, specific gravity around 2.65 - 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma beneath the Earth's surface over millions of years, often subsequently smoothed by water transport in a river or glacial environment.
Uses & applications
Used in construction, monuments, countertops, landscaping, and decorative aggregates.
Geological facts
Granite is the most common igneous rock in the Earth's continental crust and is exceptionally durable against weathering.
Field identification & locations
Easily identified by its speckled appearance of light and dark mineral crystals. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
