Granite

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Light gray, white, and black speckled; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75

Formation & Geological History

Formed from the slow crystallization of magma below Earth's surface. Primarily found in continental crust and formed over millions of years through tectonic activity.

Uses & Applications

Used extensively in construction for countertops, floor tiles, paving stones, curbing, monuments, and as crushed stone for road base.

Geological Facts

Granite is the oldest igneous rock in the world, believed to have been formed as long as 300 million years ago. It makes up a large portion of the Earth's continental crust.

Field Identification & Locations

Identify by its 'salt and pepper' appearance and visible interlocking crystals of quartz, feldspar, and mica. It is found in mountain ranges and continental interiors globally.

Identified on: 4/16/2026

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