igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Pinkish-red, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) equigranular; Cleavage: None (though feldspars show cleavage); Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pinkish-red, white, and grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-red, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) equigranular; Cleavage: None (though feldspars show cleavage); Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (plutonic). This specific specimen appears to be a rounded river stone or glacial erratic, likely originating from a Precambrian or Paleozoic formation.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stone, curbing, and as a dimension stone for monuments and memorials.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The pink/red color in this specific specimen is due to a high concentration of potassium feldspar (orthoclase).
Field identification & locations
Identify in the field by its visible interlocking crystals of different colors (salt and pepper appearance with pink hues). It is extremely common in mountainous regions or areas with exposed continental shields like the Canadian Shield.
