igneous
Granite
Granite (Phaneritic Quartz-Feldspar rock)
Hardness: 6-7 Mohs; Color: Pink, orange, gray, white; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Distinct in feldspar grains.
- Hardness
- 6-7 Mohs
- Color
- Pink, orange, gray, white
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange, gray, white; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Distinct in feldspar grains.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). They occur in continental crusts globally, often in mountain ranges like the Rockies or Appalachians, dating from the Precambrian to Cenozoic eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as crushed stone for road base.
Geological facts
Granite is the primary rock of the continental crust. The pink/orange color in this specific specimen is caused by potassium feldspar (orthoclase).
Field identification & locations
Identify in the field by its visible interlocking crystals of quartz (clear/gray), feldspar (pink/white), and mica (black/shiny). Found in batholiths and large outcrops.
