igneous
Granite
Granite (Alkali-feldspar granite)
Hardness: 6-7 (Mohs scale); Color: Pinkish-grey with orange hues; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained crystals); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Pinkish-grey with orange hues
- Luster
- Vitreous to dull
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs scale); Color: Pinkish-grey with orange hues; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained crystals); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63 - 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). Most granites are associated with continental crust formation during orogenic (mountain-building) events across various geological eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability. High-quality specimens are used in decorative architecture and as lapidary material.
Geological facts
Granite is the primary component of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous exposed granite monoliths in the world. It is incredibly resistant to erosion.
Field identification & locations
Identify by its interlocking 'mosaic' of crystals. It will typically contain visible quartz (grey/clear), feldspar (pink/white), and mica (black/shiny). Commonly found in the cores of mountain ranges and shield areas.
