Granite (Pink/Red)

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Pinkish-red due to Potassium Feldspar, mixed with white quartz and black biotite/hornblende; Luster: Dull to vitreous; Structure: Phaneritic (visible crystals); Cleavage: Distinct in feldspar grains.

Formation & Geological History

Formed from the slow cooling and crystallization of magma deep beneath the Earth's surface (intrusive). The pink color indicates a high concentration of orthoclase feldspar. Geological age can range from billions of years (Precambrian) to much younger (Cenozoic) depending on location.

Uses & Applications

Commonly used in construction as aggregate, for building facades, counter tops, and monuments. Smooth river-worn pebbles like this are popular in landscaping and as pocket stones.

Geological Facts

Granite makes up the majority of the continental crust. The pink hue specifically comes from Potassium Feldspar; without it, the rock would appear grey or white.

Field Identification & Locations

Identify in the field by its 'salt and pepper' look with pink tones. It is very hard and will scratch glass. Often found in riverbeds, glacial deposits, or mountain outcrops. This specimen is rounded due to water or glacial erosion.

Identified on: 4/27/2026

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