Weathered granite or granitic gneiss

Coarse-grained, pale pink to gray rock with black mafic minerals, earthy to weakly vitreous luster, and irregular fractures; quartz and feldspar are typically Mohs 6–7, with no prominent cleavage at the specimen scale. The banded or streaked appearance suggests possible gneissic foliation, though the image is insufficient for a definitive distinction.

Granite crystallizes slowly from silica-rich magma deep underground, while granitic gneiss forms when granite is intensely metamorphosed and foliated. Such rocks are commonly Precambrian to Paleozoic basement material and may be strongly weathered at the surface.

Crushed granite is used for aggregate, road base, and construction stone; sound, attractive material can be used for countertops and monuments. This irregular weathered piece has little jewelry or collector value.

Quartz-rich areas are hard and glassy, whereas feldspar commonly weathers to a dull, chalky surface; dark patches may be biotite mica or amphibole. A fresh broken surface would reveal the grain relationships more clearly.

Common in continental mountain belts and exposed shield terrains worldwide. Look for visible interlocking quartz and feldspar grains, occasional mica flakes, and a streaked fabric; a steel nail should not easily scratch fresh quartz-rich grains.