Granite (Pink/Potassium Feldspar Granite)

Physical Properties

Hardness: 6-7 on Mohs scale. Color: Pink to orange-red due to K-feldspar, mixed with grey quartz and black mica/hornblende. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Cleavage: Distinct in feldspars, none in quartz.

Formation & Geological History

Formed from the slow crystallization of magma below Earth's surface. This specimen appears water-worn, likely tumbled in a river or coastal environment, exposing its internal mineral grains. Can date from various geological periods, often millions to billions of years old.

Uses & Applications

Extensively used in construction (countertops, flooring, monuments), as crushed stone for road bases, and as a durable material for sculpture.

Geological Facts

Granite makes up a large part of the continental crust. The pink color specifically comes from an abundance of orthoclase feldspar. It is one of the hardest and most durable common rocks available.

Field Identification & Locations

Identify by its 'salt and pepper' appearance with prominent pink minerals. Look for visible crystalline grains of roughly equal size. Commonly found in mountainous regions or as glacial erratics near water bodies.

Identified on: 5/3/2026

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