Granite

Physical Properties

Hardness: 6-7 Mohs; Color: Pinkish-grey with visible dark speckles; Luster: Dull to vitreous; Structure: Coarse-grained phaneritic; Cleavage: None (minerals within have cleavage); Specific Gravity: 2.63 to 2.75

Formation & Geological History

Formed through the slow crystallization of magma below the Earth's surface (intrusive). Geological age varies widely from Precambrian to Cenozoic depending on the specific batholith it originated from.

Uses & Applications

Extensively used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and aesthetic appeal.

Geological Facts

Granite makes up a large portion of the Earth's continental crust. It is one of the hardest substances in the world, second only to diamonds and certain other gemstones.

Field Identification & Locations

Identify in the field by its interlocking 'salt and pepper' crystalline texture containing visible quartz (clear/grey), feldspar (pink/white), and mica (black). Commonly found in mountain ranges and eroded shield areas.

Identified on: 4/20/2026

Mode: Standard