igneous
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss
AI-generated identification · may be incorrectCoarse, mottled gray-green, pink, and cream material with a dull to slightly vitreous luster; likely Mohs hardness 6–7, no obvious cleavage as a whole, and granular interlocking crystals. The rounded edges indicate natural weathering or tumbling.
Identified More igneous →
Explore Weathered granite or granitic gneiss in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, mottled gray-green, pink, and cream material with a dull to slightly vitreous luster; likely Mohs hardness 6–7, no obvious cleavage as a whole, and granular interlocking crystals. The rounded edges indicate natural weathering or tumbling.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, typically during Precambrian to Phanerozoic mountain-building events; gneiss forms when such rock is metamorphosed under high pressure and temperature.
Uses & applications
Used as dimension stone, aggregate, paving, and monuments; attractive polished pieces may be used decoratively or as inexpensive lapidary specimens.
Geological facts
Pink areas are likely potassium feldspar, pale translucent grains quartz, and darker/greenish portions biotite, amphibole, or alteration minerals. Image-only identification is provisional because grain boundaries and foliation are indistinct.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, pink feldspar, and dark mica; granite is common in continental shield and mountain regions worldwide. A steel file should not easily scratch fresh quartz-rich grains.
