igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Pink, reddish-gray, or white with visible mineral grains; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, reddish-gray, or white with visible mineral grains
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, reddish-gray, or white with visible mineral grains; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). Most granites date back to the Precambrian or Paleozoic eras.
Uses & applications
Widely used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
Geological facts
Granite makes up much of the continental crust. The pink or red color in specimens like this is typically due to an abundance of potassium feldspar (orthoclase).
Field identification & locations
Identify by its interlocking 'salt and pepper' or speckled texture. Found globally in mountainous regions or shield areas like the Canadian Shield. For collectors, look for well-defined crystal faces in weathered outcrops.
