igneous
Granite
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 on Mohs scale. Color: Tan, pink, grey, or white with dark specks. Luster: Dull to pearly. Crystal structure: Granular (phaneritic), composed of visible quartz, feldspar, and mica crystals.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, pink, grey, or white with dark specks
- Luster
- Dull to pearly
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Tan, pink, grey, or white with dark specks. Luster: Dull to pearly. Crystal structure: Granular (phaneritic), composed of visible quartz, feldspar, and mica crystals.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. These specimens are typically found in continental crust environments, often part of ancient batholiths or mountain ranges.
Uses & applications
Commonly used in heavy construction, road base, shoreline protection (riprap), and as decorative landscaping boulders. High-quality varieties are used for countertops and monuments.
Geological facts
Granite is the most common igneous rock found on Earth's continents. It is so durable that it was used to build the Great Pyramid of Giza's inner chambers.
Field identification & locations
Identify in the field by the interlocking mosaic of light and dark crystals. It feels rough to the touch when weathered. Commonly found in quarries and massive outcroppings in mountainous regions.
