igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness (Mohs): 6-7. Color: Light grey with black specks. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible crystals). Cleavage: Imperfect. Specific gravity: 2.63 - 2.75.
- Color
- Light grey with black specks
- Luster
- Dull to vitreous
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Physical properties
Hardness (Mohs): 6-7. Color: Light grey with black specks. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible crystals). Cleavage: Imperfect. Specific gravity: 2.63 - 2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. High in silica and alkali metal oxides. Commonly found in continental crust and mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and memorial monuments due to its durability and aesthetic appeal.
Geological facts
Granite makes up a large part of the continental crust. Half Dome in Yosemite National Park is one of the world's most famous granite monoliths.
Field identification & locations
Identify by its interlocking 'salt and pepper' appearance of quartz, feldspar, and mica crystals. Commonly found in batholiths and mountain cores.
