igneous
Granite
Intrusive igneous felsic rock
Hardness: 6-7 Mohs; Color: Pink, reddish, grey, or white with dark specks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, reddish, grey, or white with dark specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, reddish, grey, or white with dark specks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. It is found in the continental crust and often dates to the Precambrian or Paleozoic eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as aggregate for roads.
Geological facts
Granite makes up a large portion 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 interlocking mineral crystals of quartz (clear/grey), feldspar (pink/white), and mica (black). It is found globally in mountainous regions and shield areas. It is an excellent specimen for learning about intrusive cooling.
