igneous
Black granite with pink feldspar
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled black-and-pink appearance with a vitreous-to-dull luster; hardness about 6–7 Mohs, massive structure, and no prominent cleavage as a rock. The small dark object appears to be a separate dark mineral or stone, but its identity cannot be confirmed from the image.
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Physical properties
Coarse-grained, speckled black-and-pink appearance with a vitreous-to-dull luster; hardness about 6–7 Mohs, massive structure, and no prominent cleavage as a rock. The small dark object appears to be a separate dark mineral or stone, but its identity cannot be confirmed from the image.
Formation & geological history
Intrusive igneous rock formed by slow cooling and crystallization of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic events. It is later exposed by uplift and erosion.
Uses & applications
Widely used for countertops, monuments, tiles, flooring, building facades, and crushed aggregate; polished slabs have modest decorative value.
Geological facts
Pink or salmon patches are potassium feldspar, gray translucent grains are quartz, and dark grains are commonly biotite or hornblende. The pattern and high polish are typical of commercial dimension-stone granite.
Field identification & locations
Identify it by interlocking visible crystals, pink feldspar, gray quartz, and dark mica/amphibole; it scratches glass weakly to moderately and does not fizz with dilute acid. Common worldwide, including India, Brazil, Finland, Canada, and the United States.
