igneous
Granite
Granite (Phaneritic igneous rock)
Hardness: 6-7 Mohs; Color: Pinkish-brown to tan with small dark speckles; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Composition: Quartz, Potassium Feldspar, and Plagioclase.
- Hardness
- 6-7 Mohs
- Color
- Pinkish-brown to tan with small dark speckles
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-brown to tan with small dark speckles; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Composition: Quartz, Potassium Feldspar, and Plagioclase.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). The pinkish hue suggests a high concentration of orthoclase feldspar.
Uses & applications
Mainly used in construction, countertops, monuments, and as crushed stone for road aggregate due to its extreme durability.
Geological facts
Granite is the most common rock found in the Earth's continental crust. Its name comes from the Latin word 'granum', meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identify by its interlocking crystalline texture and lack of layering. Found globally in mountainous regions and shield areas. Very common in residential landscaping gravel.
