igneous
Red Granite
Felsic intrusive igneous rock (K-feldspar rich Granite)
Hardness: 6-7 Mohs; Color: Pinkish-red to deep red base with translucent quartz; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pinkish-red to deep red base with translucent quartz
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-red to deep red base with translucent quartz; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow cooling of silica-rich magma deep within the Earth's crust (plutonic). The red color is caused by an abundance of potassium feldspar (orthoclase) and traces of hematite. Most deposits date from the Precambrian to Paleozoic eras.
Uses & applications
Extensively used as dimensional stone for construction, kitchen countertops, monument carving, and exterior cladding. Used as crushed aggregate for road beds and landscaping.
Geological facts
Famous red granites include the 'Aswan Granite' used in Ancient Egyptian obelisks and the 'Imperial Red' from India. It is one of the most durable natural building materials, resistant to weathering and acid rain.
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture; look for distinct pink/red blocky crystals of potassium feldspar alongside grey, glassy quartz. Found in continental volcanic arcs and mountain roots globally.
