igneous
Pink granite (likely biotite-bearing)
Granitic rock; chiefly quartz, K-feldspar, plagioclase, and biotite
AI-generated identification · may be incorrectCoarse-grained, pink to salmon, with a dark biotite-rich band or inclusion; typically Mohs 6–7, vitreous-to-dull luster, interlocking crystals, and no prominent cleavage as a whole. The dark layer may be a mafic schlieren, biotite-rich seam, or xenolith.
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Physical properties
Coarse-grained, pink to salmon, with a dark biotite-rich band or inclusion; typically Mohs 6–7, vitreous-to-dull luster, interlocking crystals, and no prominent cleavage as a whole. The dark layer may be a mafic schlieren, biotite-rich seam, or xenolith.
Formation & geological history
Slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Mesozoic mountain-building events; the dark band formed by magma segregation or incorporation of mafic material.
Uses & applications
Used for countertops, building stone, monuments, aggregate, and decorative specimens; this small irregular piece has modest collector value.
Geological facts
Pink color generally comes from potassium feldspar, while black areas commonly reflect biotite or hornblende. Granite is intrusive equivalent to rhyolite, its volcanic counterpart.
Field identification & locations
Identify it by visible interlocking pink feldspar, gray-clear quartz, and black mica, unlike sandstone or cement. Common worldwide, including India, Brazil, Scandinavia, Canada, and the U.S.; a fresh cut surface and streak-free hardness test help confirm it.
