igneous
Granite
Felsic intrusive igneous rock (Granite)
Hardness: 6-7 on Mohs scale; Color: salt-and-pepper (white, grey, black, pink); Luster: dull to vitreous; Structure: phaneritic (coarse-grained) crystalline; Composition: Quartz, Feldspar, and Mica.
- Hardness
- 6-7 on Mohs scale
- Color
- salt-and-pepper (white, grey, black, pink)
- Luster
- dull to vitreous
Identified More igneous →
Explore Granite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale; Color: salt-and-pepper (white, grey, black, pink); Luster: dull to vitreous; Structure: phaneritic (coarse-grained) crystalline; Composition: Quartz, Feldspar, and Mica.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears to be a river-worn or beach-tumbled pebble with a distinct vein of lighter mineral (likely quartz or feldspar) running through it.
Uses & applications
Widely used for countertops, floor tiles, paving stone, curbing, monuments, and as an aggregate in construction. High-quality specimens are popular for rock tumbling.
Geological facts
Granite makes up much of the Earth's continental crust. It is one of the hardest and most durable natural stones, which is why it has been used in architecture since Ancient Egypt.
Field identification & locations
Look for a 'salt and pepper' appearance with visible interlocking crystals. It is massive (lacks layering) and very hard—it cannot be scratched by a steel knife. Commonly found in mountainous regions or as glacial erratics.
