igneous
Red Granite
Felsic Intrusive Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Reddish-pink, black, and grey phaneritic texture; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) crystalline; Cleavage: Two directions for feldspar at 90 degrees; Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-pink, black, and grey phaneritic texture
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-pink, black, and grey phaneritic texture; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) crystalline; Cleavage: Two directions for feldspar at 90 degrees; Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. The red color suggests a high concentration of potassium feldspar (orthoclase). These formations can occur throughout geological history, often in continental continental crust or mountain roots.
Uses & applications
Primarily used in construction for countertops, monuments, floor tiles, and as a decorative stone in landscaping and internal architecture due to its durability and aesthetic appeal.
Geological facts
The red color comes from iron-rich orthoclase or impurities in the mineral matrix. Granite makes up much of the continuous continental crust and has been used in ancient monuments like the Egyptian pyramids.
Field identification & locations
Identify by its interlocking coarse grains of red/pink feldspar, white/clear quartz, and dark mica. Commonly found in batholiths and exposed shield areas like the Canadian Shield or the Scottish Highlands.
