igneous
Granite
Granite (Plutonic Igneous Rock)
AI-generated identification · may be incorrectHardness: 6-7 Mohs scale. Color: speckled pinkish-tan, cream, black, and gray. Luster: vitreous to dull. Texture: phaneritic (medium to coarse-grained granular texture). Mineral constituents: quartz, potassium feldspar, plagioclase feldspar, and mica (biotite/muscovite).
- Hardness
- 6-7 Mohs scale
- Color
- speckled pinkish-tan, cream, black, and gray
- Luster
- vitreous to dull
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Physical properties
Hardness: 6-7 Mohs scale. Color: speckled pinkish-tan, cream, black, and gray. Luster: vitreous to dull. Texture: phaneritic (medium to coarse-grained granular texture). Mineral constituents: quartz, potassium feldspar, plagioclase feldspar, and mica (biotite/muscovite).
Formation & geological history
Formed from the slow crystallization of felsic magma deep beneath Earth's surface (intrusive igneous activity). Common across continental crust, originating over vast geological timescales from Precambrian to Cenozoic eras.
Uses & applications
Extensive use in construction as dimension stone, countertops, paving blocks, and crushed stone for aggregate. Popular for curbing, monuments, and decorative architectural elements due to high durability and weather resistance.
Geological facts
Granite forms the core of most continental crusts. Yosemite National Park's Half Dome and Mount Rushmore are famous granitic geological formations.
Field identification & locations
Identify by its interlocking crystalline texture containing visible quartz (glassy gray/clear), feldspar (pink, tan, or white), and dark mineral flecks (biotite mica or hornblende). Found abundantly worldwide in mountain ranges and eroded plutonic shields.
