igneous
Granite (Pink/Potassium Feldspar rich)
Granite (K-feldspar rich intrusive igneous rock)
Hardness: 6-7 Mohs; Color: Pink, salmon, or tan mixed with gray/black grains; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, salmon, or tan mixed with gray/black grains
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, salmon, or tan mixed with gray/black grains; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. High concentrations of orthoclase (potassium feldspar) give it the distinct pink hue. Often found in continental crust and mountain ranges from various geological eras.
Uses & applications
Extensively used in construction, countertops, monuments, paving stones, and as crushed stone for road base. Varieties with large crystals are popular as decorative specimens.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Its name comes from the Latin 'granum', meaning a grain, referring to its coarse-grained texture.
Field identification & locations
Identified by its visible interlocking crystals of feldspar (pink/white), quartz (gray/clear), and mica (black/shiny). Common in shield areas like the Canadian Shield or Rockies. Useful for collectors as an example of intrusive igneous cooling.
