igneous
Red Granite
Intrusive Igneous Rock (Felsic)
Hardness of 6 on the Mohs scale; reddish to pinkish coloration due to potassium feldspar; dull to vitreous luster; phaneritic (coarse-grained) crystal structure; contains quartz, alkali feldspar, plagioclase, and biotite; specific gravity around 2.65 to 2.75.
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Physical properties
Hardness of 6 on the Mohs scale; reddish to pinkish coloration due to potassium feldspar; dull to vitreous luster; phaneritic (coarse-grained) crystal structure; contains quartz, alkali feldspar, plagioclase, and biotite; specific gravity around 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma rich in silica and alkali metals deep beneath the Earth's crust, typically over millions of years during various geological eras.
Uses & applications
Widely used in construction for dimension stone, countertops, monuments, architectural facing, and paving materials.
Geological facts
Red granite is extremely durable and weather-resistant, which is why it has been used for centuries in monuments and buildings designed to last. The red color comes from iron oxide impurities in the potassium feldspar crystals.
Field identification & locations
Can be identified in the field by its interlocking, visible mineral crystals (especially pink/red feldspar and translucent quartz grains). Found globally in continental shields and mountain roots.
