Granite

Physical Properties

Hardness: 6-7 on Mohs scale. Color: mottled pink, white, gray, and black. Luster: dull to shiny depending on the minerals present. Crystal structure: Phaneritic (coarse-grained).

Formation & Geological History

Formed from the slow crystallization of magma below Earth's surface. Can be found in continental crust worldwide.

Uses & Applications

Widely used in construction for countertops, flooring, tombstones, and monuments.

Geological Facts

Granite is one of the most common rocks in the continental crust. The pink color in this specimen is likely due to potassium feldspar.

Field Identification & Locations

Identified by its visible crystalline structure and combination of quartz (gray/clear), feldspar (pink/white), and mica or amphibole (black/dark green).

Identified on: 4/26/2026

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