igneous
Granite
Plutonic Igneous Rock
Hardness: 6-7 on Mohs scale. Colors range widely from pink to gray, white, and black depending on its mineral composition. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible crystals). Specific gravity: 2.65-2.75.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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. Colors range widely from pink to gray, white, and black depending on its mineral composition. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible crystals). Specific gravity: 2.65-2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma below the Earth's surface over millions of years. It is a major component of the continental crust.
Uses & applications
Widely used in construction, countertops, monuments, floor tiles, and curbing due to its high durability and resistance to weathering.
Geological facts
Granite is the most common intrusive igneous rock in the Earth's crust and is found on all continents. It often contains radioactive elements like uranium and thorium, which can be measured as background radiation.
Field identification & locations
Easily identified by its speckled appearance, consisting of interlocked mineral grains such as quartz, feldspar, and biotite mica. Common worldwide in mountainous regions and shield areas.
