igneous
Reddish granite or granitic gneiss
Felsic granitoid; chiefly quartz, feldspar, and mica, colored by iron oxides
AI-generated identification · may be incorrectPink-red, coarse crystalline texture with gray-green mineral patches and weathered surfaces; likely Mohs 6–7, vitreous to dull luster, poor cleavage as a rock, and specific gravity about 2.6–2.8.
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Physical properties
Pink-red, coarse crystalline texture with gray-green mineral patches and weathered surfaces; likely Mohs 6–7, vitreous to dull luster, poor cleavage as a rock, and specific gravity about 2.6–2.8.
Formation & geological history
Formed from slowly cooled silica-rich magma, probably Precambrian to Paleozoic in age; surface oxidation and weathering produce the reddish coloration. The photograph cannot distinguish confidently between granite and weakly foliated granitic gneiss.
Uses & applications
Commonly used as crushed stone, aggregate, building stone, monuments, and decorative landscaping material; this small weathered specimen has minimal commercial value.
Geological facts
The pink color typically comes from potassium feldspar, while dark grains are biotite or amphibole and greenish areas may reflect chlorite or epidote alteration.
Field identification & locations
Identify it by visible interlocking quartz and feldspar grains, hardness sufficient to scratch glass, and lack of fizzing with dilute acid. Common in continental shields and mountain belts worldwide.
