igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Gray, pink, white with dark speckles; Luster: Dull to vitreous; Structure: Phaneritic (visible crystals); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- Gray, pink, white with dark speckles
- 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 Mohs; Color: Gray, pink, white with dark speckles; Luster: Dull to vitreous; Structure: Phaneritic (visible crystals); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). Geological age varies widely from Precambrian to Cenozoic depending on the pluton.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most common rocks on the planet.
Field identification & locations
Identify by its interlocking 'salt and pepper' appearance of crystals. Commonly found in mountainous regions or where ancient tectonic plates collided.
