igneous
Granite
Phaneritic plutonic rock (composed of quartz, feldspar, and mica)
Hardness: 6-7 Mohs; Color: Pinkish-tan with dark specks; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Imperfect; Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pinkish-tan with dark specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-tan with dark specks; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Imperfect; Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specimen appears to be a weathered or water-worn intrusive igneous rock common in continental crust formations.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and monument sculpting due to its durability and aesthetic appeal.
Geological facts
Granite is the primary rock of Earth's continental crust. It is one of the hardest natural substances and has been used throughout history by various civilizations, including for the pyramids of Egypt.
Field identification & locations
Identified by its visible interlocking crystals of different colors (pink/white feldspar, clear quartz, and black mica). Found globally in mountain ranges and eroded shields.
