igneous
Red Granite
Phaneritic Felsic Igneous Rock (high K-feldspar)
Hardness: 6-7 (Mohs scale); Color: Red, pinkish-orange, gray, and black; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse crystals); Specific Gravity: 2.63–2.75.
- Hardness
- 6-7 (Mohs scale)
- Color
- Red, pinkish-orange, gray, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Red, pinkish-orange, gray, and black; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse crystals); Specific Gravity: 2.63–2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. The specific red color comes from an abundance of potassium feldspar (orthoclase). These rocks are often millions to billions of years old, typically found in continental crust batholiths.
Uses & applications
Widely used in heavy construction, road base, architectural facing, countertops, and as decorative landscaping gravel.
Geological facts
Granite is one of the most common rocks in the Earth's crust. Red granite was specifically prized by Ancient Egyptians for building obelisks and lining chambers within the pyramids.
Field identification & locations
Identify by its interlocking crystalline texture and lack of layering. It will easily scratch glass. Commonly found in mountainous regions or glacial till. Collectors look for unique color variations or large crystal faces.
