Igneous
Granite
Granite
Hardness: 6-7 (Mohs scale), Color: Varies widely depending on mineral composition, often pink, white, gray, or black, Luster: Vitreous (glassy), Crystal structure: Interlocking coarse grains, predominantly quartz, feldspar, and mica, Cleavage: Minerals have variable cleavage, but the rock itself does not, Specific grav…
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Varies widely depending on mineral composition, often pink, white, gray, or black, Luster: Vitreous (glassy), Crystal structure: Interlocking coarse grains, predominantly quartz, feldspar, and mica, Cleavage: Minerals have variable cleavage, but the rock itself does not, Specific gravity: 2.6-2.8
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. Intrusion of magma cools slowly, allowing large crystals to form.
Uses & applications
Extensively used in construction, monuments, interior countertops, and flooring due to its durability and aesthetic appeal.
Geological facts
Granite is a major component of Earth's continental crust. Mount Rushmore is carved into a massive granite outcrop.
Field identification & locations
Identifiable by its coarse-grained texture and typical mineral composition (quartz, feldspar, mica). Found globally in continental shields and mountain ranges.
