igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (white, grey, and black). Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained). Cleavage: None (fractures). Specific gravity: 2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Salt-and-pepper (white, grey, and black)
- Luster
- Dull to vitreous
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: Salt-and-pepper (white, grey, and black). Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained). Cleavage: None (fractures). Specific gravity: 2.63 - 2.75.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). It is a major component of the continental crust, with ages ranging from billions of years to more recent tectonic events.
Uses & applications
Extensively used in construction (countertops, tiles, paving), monuments, and as crushed stone for road base and railroad ballast.
Geological facts
Granite is one of the hardest and most common rocks in the world. Famous landmarks like Mount Rushmore and the Egyptian pyramids contain various types of granite structures.
Field identification & locations
Identify in the field by its coarse-grained interlocking crystals and lack of foliation. Common in mountain ranges and continental shields. Look for visible flecks of quartz, feldspar, and mica.
