igneous
Pink granite (likely weathered granite or granitic gneiss)
Granite; primarily quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, pink, white, gray, and black mottling; vitreous quartz and dull feldspar luster. Mohs hardness about 6–7, with no prominent cleavage as a whole; typical specific gravity 2.63–2.75.
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Physical properties
Coarse-grained, pink, white, gray, and black mottling; vitreous quartz and dull feldspar luster. Mohs hardness about 6–7, with no prominent cleavage as a whole; typical specific gravity 2.63–2.75.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, allowing large crystals to grow; commonly Precambrian to Mesozoic in age depending on source. Surface weathering rounded the specimen and may have produced the brownish staining.
Uses & applications
Widely used as dimension stone, countertops, monuments, aggregate, and landscaping rock; attractive polished pieces are occasionally collected. This small rounded specimen generally has minimal commercial value.
Geological facts
The pink color usually comes from potassium feldspar, while dark flecks are biotite or hornblende and translucent grains are quartz. Strong color and texture variation can occur even within one granite body.
Field identification & locations
Identify it by its visibly interlocking coarse crystals, pink feldspar, gray or glassy quartz, and black mica/amphibole; it should not fizz with dilute hydrochloric acid. Common worldwide, especially in mountain belts and continental shields.
