Red Granite

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Pinkish-red to deep red due to potassium feldspar; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75

Formation & Geological History

Formed from the slow cooling of silica-rich magma deep underground (plutonic). Found in continental crust; often dated from the Precambrian to Cenozoic eras.

Uses & Applications

Widely used in construction, countertops, monuments, curbing, and as decorative landscaping stone.

Geological Facts

The red color comes from high concentrations of orthoclase (potassium) feldspar. It is one of the hardest and most durable common stones, often used in ancient Egyptian architecture.

Field Identification & Locations

Identify by its interlocking crystalline texture and prominent red/pink feldspar crystals mixed with clear quartz. Common in glacial till and coastal areas where bedrock has been eroded.

Identified on: 5/3/2026

Mode: Standard