igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (mottled black and white/grey); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Varies by mineral (feldspar has two at 90 degrees); Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Salt and pepper (mottled black and white/grey)
- 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: Salt and pepper (mottled black and white/grey); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Varies by mineral (feldspar has two at 90 degrees); Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow cooling and solidification of magma below the Earth's surface (intrusive). They can be hundreds of millions to billions of years old, often found in the continental crust of shield areas.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite is the most common igneous rock found at Earth's surface and makes up the bulk of the continental crust. The white/grey parts are typically quartz and feldspar, while the black parts are often biotite mica or hornblende.
Field identification & locations
Identify in the field by its coarse, interlocking grains and 'salt and pepper' appearance. It is found in mountain ranges and rocky outcroppings globally. It will not react with acid, unlike limestone.
