igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale. Color: Pink, red, white, or gray with dark speckles. Luster: Vitreous to dull. Crystal structure: Phaneritic (large, visible interlocking crystals). Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, red, white, or gray with dark speckles
- 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 on Mohs scale. Color: Pink, red, white, or gray with dark speckles. Luster: Vitreous to dull. Crystal structure: Phaneritic (large, visible interlocking crystals). Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). They are found in the continental crust and have formed throughout all geological ages, notably in mountain belts and cratons.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as a dimension stone for buildings.
Geological facts
Granite makes up a large part of the continental crust. The Egyptian pyramids, such as the Great Pyramid of Giza, utilize massive granite blocks in their inner chambers and passages.
Field identification & locations
Identify by its coarse-grained texture where individual crystals of quartz (translucent) and feldspar (colored/opaque) are easily seen. Commonly found in mountainous regions or areas where erosion has exposed the continental basement rock. It is one of the most common rocks on Earth.
