igneous
Red Granite
Granite (Felsic Plutonic Rock)
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
- Hardness
- 6-7 on Mohs scale
- Color
- Pinkish-red to deep red due to potassium feldspar
- Luster
- Dull to vitreous
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
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.
