igneous
Pink Granite
Granite (Alkali Feldspar Granite)
Hardness 6-7 Mohs, Pink to reddish-orange color with grey/black flecks, Phaneritic texture (visible grains), Dull to vitreous luster, No cleavage on the rock level though component feldspar shows it, SG 2.63-2.75
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Physical properties
Hardness 6-7 Mohs, Pink to reddish-orange color with grey/black flecks, Phaneritic texture (visible grains), Dull to vitreous luster, No cleavage on the rock level though component feldspar shows it, SG 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. High in potassium feldspar (orthoclase) which provides the pink hue. Often found in continental crust and mountain ranges.
Uses & applications
Used in construction for countertops, floor tiles, and outdoor monuments. Popular as a polished river stone or decorative landscaping rock.
Geological facts
Granite makes up the majority of Earth's continental crust. The pink color specifically indicates a high concentration of orthoclase feldspar rather than plagioclase.
Field identification & locations
Identify by its interlocking crystalline texture and speckled appearance; it will contain pink feldspar, clear quartz, and black mica (biotite). Common in glacially deposited river gravels.
