igneous
Granite
Felsic Plutonic Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Pink, white, cream with grey/black specks; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Composition: Quartz, Potassium Feldspar (Orthoclase), and Mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, cream with grey/black specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, cream with grey/black specks; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Composition: Quartz, Potassium Feldspar (Orthoclase), and Mica.
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. This specimen shows a high concentration of pink orthoclase feldspar. Common in continental crust and mountain ranges from all geological periods.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, monuments, and as a decorative building stone due to its durability.
Geological facts
Granite is one of the hardest substances in the world. It is the most common igneous rock found on Earth's continents and makes up the core of many mountain chains.
Field identification & locations
Identify by its visible interlocking crystals of different colors (usually pink, white, and black). It will not be scratched by a steel knife. Found in outcrops, rivers in mountainous regions, or as glacial erratics.
