igneous
Granite Pebble
Felsic intrusive igneous rock
Hardness: 6-7 on Mohs scale; Color: typically white, gray, or pink with dark specks; Luster: vitreous to dull; Crystal structure: phaneritic (visible crystals of quartz, feldspar, and mica); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- typically white, gray, or pink with dark specks
- Luster
- vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: typically white, gray, or pink with dark specks; Luster: vitreous to dull; Crystal structure: phaneritic (visible crystals of quartz, feldspar, and mica); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specific specimen has been polished and rounded by water erosion (fluvial or beach action). Geological age varies by location, often millions to billions of years old.
Uses & applications
Used widely in construction (countertops, flooring), road gravel, and as decorative landscaping stones.
Geological facts
Granite makes up a large part of the Earth's continental crust. Over 80% of the Earth's crust is made of igneous rock, and granite is the most common of these. The dark specks are usually biotite mica or hornblende.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals. Common in mountainous regions, riverbeds, and glacial deposits. Very common worldwide.
