igneous
Granite
Phaneritic igneous rock consisting of Quartz, Potassium Feldspar, and Plagioclase
Hardness: 6-7 on Mohs scale. Color: mottled pink, white, gray, and black. Luster: vitreous to dull (polished in photo). Structure: Phaneritic (visible crystals). Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- mottled pink, white, gray, and black
- Luster
- vitreous to dull (polished in photo)
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Physical properties
Hardness: 6-7 on Mohs scale. Color: mottled pink, white, gray, and black. Luster: vitreous to dull (polished in photo). Structure: Phaneritic (visible crystals). Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). Common in continental crust and mountain ranges, often dating back hundreds of millions to billions of years.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite makes up a large part of the continental crust. The name comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible interlocking crystals of quartz and feldspar. Found globally in mountainous regions and glacial deposits.
