igneous
Pink-gray granite
Granite; primarily quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled pink, white, gray, and black appearance; interlocking crystals with glassy quartz and feldspar luster. Hardness is typically about 6–7 Mohs; massive, with no prominent cleavage as a whole, though feldspar crystals cleave.
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Physical properties
Coarse-grained, speckled pink, white, gray, and black appearance; interlocking crystals with glassy quartz and feldspar luster. Hardness is typically about 6–7 Mohs; massive, with no prominent cleavage as a whole, though feldspar crystals cleave.
Formation & geological history
A plutonic igneous rock formed when silica-rich magma cooled slowly deep in the continental crust, allowing large crystals to grow. Its exact age cannot be determined from the image; granites range from Precambrian to recent geologic ages.
Uses & applications
Widely used for building stone, monuments, countertops, paving, and aggregate; attractive polished pieces are also collected and occasionally used decoratively.
Geological facts
The pink coloration commonly comes from potassium feldspar, while dark minerals are biotite or hornblende. The rock appears weathered and may include darker mineral-rich or altered zones.
Field identification & locations
Identify it by its visible interlocking grains, quartz, pink/cream feldspar, and black mica or amphibole; it is not layered and does not fizz with dilute acid. Common in continental mountain belts and exposed plutonic terrains worldwide.
