igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Hardness: 6-7 Mohs; Color: Pinkish-tan with black mottling; Luster: Dull (weathered) to vitreous (minerals); Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.6-2.7
- Hardness
- 6-7 Mohs
- Color
- Pinkish-tan with black mottling
- Luster
- Dull (weathered) to vitreous (minerals)
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-tan with black mottling; Luster: Dull (weathered) to vitreous (minerals); Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.6-2.7
Formation & geological history
Intrusive igneous formation occurring from the slow crystallization of magma below Earth's surface. This specimen appears water-worn, likely from a fluvial or glacial environment.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, monuments, and as crushed stone for road base.
Geological facts
Granite makes up the majority of the Earth's continental crust. It is one of the hardest and most durable common stones, often dated back hundreds of millions to billions of years.
Field identification & locations
Identify by its salt-and-pepper look and visible interlocking crystals of different colors. It is found globally in mountain ranges and glacial deposits. This rounded cobble is likely a 'glacial erratic' or river stone.
