igneous
Pink granite
Coarse-grained granitic rock, chiefly orthoclase microcline feldspar, quartz, and dark biotite/amphibole
AI-generated identification · may be incorrectHardness about 6–7 Mohs; mottled salmon-pink, white, gray, and black; typically vitreous quartz and glassy-to-pearly feldspar luster. Interlocking crystals show no foliation or obvious cleavage as a whole, though feldspar has cleavage.
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Physical properties
Hardness about 6–7 Mohs; mottled salmon-pink, white, gray, and black; typically vitreous quartz and glassy-to-pearly feldspar luster. Interlocking crystals show no foliation or obvious cleavage as a whole, though feldspar has cleavage.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to younger continental mountain-building events. The rounded shape indicates later weathering and stream or glacial transport.
Uses & applications
Used as dimension stone, countertops, monuments, paving, aggregate, and landscaping stone; attractive hand specimens are collected. It is generally inexpensive unless unusually patterned or from a notable locality.
Geological facts
The pink color usually comes from potassium feldspar, while black grains are biotite or hornblende and translucent grains are quartz. Individual crystals are visible because underground cooling was slow.
Field identification & locations
Identify it by its coarse, interlocking texture and pink feldspar mixed with gray-white quartz and black mafic minerals; it will not fizz with dilute acid. Common worldwide, especially in large continental batholiths and Precambrian shields.
