igneous
Pink granite (weathered, rounded cobble)
Granite; predominantly quartz, potassium feldspar, plagioclase, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, pale pink to gray with black-green mineral flecks; quartz has glassy luster, feldspar is blocky, and mica may be dark and flaky. Hardness is about 6–7 Mohs, with no dominant cleavage as a whole and specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, pale pink to gray with black-green mineral flecks; quartz has glassy luster, feldspar is blocky, and mica may be dark and flaky. Hardness is about 6–7 Mohs, with no dominant cleavage as a whole and specific gravity around 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to younger continental mountain-building events. Its rounded shape and surface weathering likely resulted from transport by water or glacial action.
Uses & applications
Used widely as dimension stone, countertops, monuments, building aggregate, paving, and landscaping; attractive polished pieces are also collected.
Geological facts
The pink color commonly comes from potassium feldspar, while dark patches are biotite, hornblende, or alteration minerals. The specimen appears weathered and may contain minor iron-oxide staining or epidote.
Field identification & locations
Identify granite by visible interlocking crystals of quartz and feldspar rather than layering or fossils; a glassy quartz grain will not scratch easily with a steel blade. Common worldwide, especially in continental shields and mountain belts.
