
igneous
Granite
Granite (composed of Quartz, Felspar, and Mica)
Phaneritic (coarse-grained) texture; Mohs hardness 6-7; Pink/white/gray color; Vitreous luster on crystal faces; Granular structure; Specific gravity 2.63-2.75.
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Physical properties
Phaneritic (coarse-grained) texture; Mohs hardness 6-7; Pink/white/gray color; Vitreous luster on crystal faces; Granular structure; Specific gravity 2.63-2.75.
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface (intrusive). This specimen shows rounding likely from alluvial/water erosion. Massive deposits found in continental crust across all geological eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments. Also used as crushed stone in roadbeds and as a collector's specimen for demonstrating igneous textures.
Geological facts
Granite is the most common rock found in the Earth's continental crust. It is incredibly durable; many of the world's oldest surviving monuments are carved from it.
Field identification & locations
Identify by its salt-and-pepper appearance and visible individual crystals of pink/white feldspar and translucent quartz. Frequently found in riverbeds, glacial tills, and mountain ranges.