igneous
Granite
Felsic Intrusive Igneous Rock
Hardness: 6-7 (Mohs), Color: Salt-and-pepper (white/grey/pink), Luster: Dull to vitreous, Structure: Phaneritic (visible crystals), SG: 2.63-2.75
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Physical properties
Hardness: 6-7 (Mohs), Color: Salt-and-pepper (white/grey/pink), Luster: Dull to vitreous, Structure: Phaneritic (visible crystals), SG: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. High in silica and alkali metal oxides. Predominantly found in continental crust and mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, monuments, and as crushed stone for road base.
Geological facts
Granite makes up the majority of Earth's continental crust and is the main component of famous landmarks like Mount Rushmore and Yosemite's El Capitan.
Field identification & locations
Identify by its interlocking crystalline texture containing quartz and feldspar. Found globally in mountainous regions. Collectors look for unique color variations.
