igneous
Pink-gray granite
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled pink, white, and dark gray; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no true cleavage as a whole. The pink color reflects potassium feldspar, while translucent grains are quartz.
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Physical properties
Coarse-grained, speckled pink, white, and dark gray; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no true cleavage as a whole. The pink color reflects potassium feldspar, while translucent grains are quartz.
Formation & geological history
An intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to younger mountain-building events. The rounded shape indicates weathering or transport as a cobble/boulder.
Uses & applications
Used extensively for building stone, countertops, monuments, paving, aggregate, and landscaping; attractive pieces are sold as lapidary or display specimens.
Geological facts
Granite’s visible crystals record slow underground cooling, unlike fine-grained volcanic rhyolite. Its durability comes from tightly interlocked quartz and feldspar grains.
Field identification & locations
Identify it by coarse interlocking crystals, pink feldspar, gray-white quartz, and scattered dark mica or amphibole; it commonly occurs in continental plutons and glacial or river deposits. Exact locality and mineral proportions would require testing or a fresh surface.
