igneous
Granite
Granite (Phaneritic Igneous Rock)
Hardness (6-7), Color: Salt-and-pepper (gray, white, black), Luster: Dull to vitreous, Crystal structure: Intrusive Phaneritic (coarse crystals visible), Specific Gravity: 2.63 - 2.75
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Physical properties
Hardness (6-7), Color: Salt-and-pepper (gray, white, black), Luster: Dull to vitreous, Crystal structure: Intrusive Phaneritic (coarse crystals visible), Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. Found in continental crust, often formed during orogenic (mountain-building) events across various geological eras.
Uses & applications
Widely used in construction, countertops, flooring, monuments, and as crushed stone for road aggregate.
Geological facts
Granite makes up a large part of the continental crust. The black spots are typically biotite or hornblende, while the white/gray parts are quartz and feldspar.
Field identification & locations
Identify in the field by the interlocking mosaic of visible minerals and its extreme hardness. Found globally in mountainous regions and shield areas.
