igneous
Pink granite
Granite, chiefly quartz–alkali feldspar–plagioclase with biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, massive, mottled pink, white, gray, and black; vitreous quartz and feldspar luster, no consistent cleavage as a rock. Individual minerals are typically Mohs 6–7; specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, massive, mottled pink, white, gray, and black; vitreous quartz and feldspar luster, no consistent cleavage as a rock. Individual minerals are typically Mohs 6–7; specific gravity about 2.6–2.7.
Formation & geological history
An intrusive felsic igneous rock crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic plutonic events. The rounded shape indicates natural weathering or tumbling/polishing.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping stone; attractive hand specimens are collected but are generally inexpensive.
Geological facts
The pink color usually comes from potassium feldspar, while black minerals are commonly biotite or amphibole. The specimen may also be a closely related pink granitic pegmatite or gneiss, but its texture appears predominantly granitic.
Field identification & locations
Identify it by visible interlocking crystals of pink feldspar, translucent/gray quartz, and dark mica or amphibole; it should not fizz with dilute hydrochloric acid. Common worldwide in continental shields and granite batholiths.
