igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 (Mohs scale); Color: speckled gray, white, and black; Luster: Vitreous to dull; Crystal structure: Coarse-grained (phaneritic); Cleavage: Perfect on feldspar grains; Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- speckled gray, white, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: speckled gray, white, and black; Luster: Vitreous to dull; Crystal structure: Coarse-grained (phaneritic); Cleavage: Perfect on feldspar grains; Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. These rocks are found in continental crust and are typically associated with mountain-building tectonic events involving various geological eras.
Uses & applications
Used in construction, monuments, countertops, and as road aggregate. Small pebbles are often used in landscaping or aquarium gravel.
Geological facts
Granite is the most common igneous rock found on Earth's continents. The name comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identify by its 'salt and pepper' appearance caused by light-colored feldspar/quartz and dark biotite or hornblende. Commonly found in riverbeds or near mountain ranges.
