igneous
Granite
Felsic Plutonic Rock (primarily SiO2)
Hardness (Mohs scale): 6-7. Color: Salt-and-pepper (white, grey, and black). Luster: Dull to vitreous. Crystal structure: Phaneritic (large, visible crystals). Cleavage: Non-existent in the rock itself, but present in mica/feldspar components.
- Color
- Salt-and-pepper (white, grey, and black)
- Luster
- Dull to vitreous
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Physical properties
Hardness (Mohs scale): 6-7. Color: Salt-and-pepper (white, grey, and black). Luster: Dull to vitreous. Crystal structure: Phaneritic (large, visible crystals). Cleavage: Non-existent in the rock itself, but present in mica/feldspar components.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears water-worn or tumbled, likely sourced from a riverbed or coastal area. Granite is ubiquitous in continental crust.
Uses & applications
Construction (countertops, flooring), monuments, curbing, and as crushed stone for road base. Polished high-grade specimens are used in architecture and jewelry.
Geological facts
Granite is the most common igneous rock found on Earth's continents. It makes up the core of many mountain ranges and is a primary component of the continental crust.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals of quartz, feldspar, and mica. It is found globally in mountainous regions and riverbeds.
