igneous
Granite
Felsic intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically gray, pink, or white with visible mineral crystals, dull to subvitreous luster, and phaneritic texture.
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Physical properties
Hardness of 6 on the Mohs scale, typically gray, pink, or white with visible mineral crystals, dull to subvitreous luster, and phaneritic texture.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep beneath the Earth's surface approximately 1.7 billion years ago in the Black Hills.
Uses & applications
Widely used in monumental architecture, building construction, countertops, and decorative stone due to its exceptional durability.
Geological facts
The rock formation featured in the image is the Harney Peak granite, which makes up Mount Rushmore and provides a stable medium for carving.
Field identification & locations
Identified by interlocking grains of quartz, alkali feldspar, and plagioclase; commonly found in continental shields and mountain cores.
