igneous
Weathered granite boulder
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled gray-brown with rusty iron-oxide staining; constituent minerals are typically Mohs 6–7 (quartz), with vitreous to pearly luster and no consistent cleavage as a whole rock.
Identified More igneous →
Explore Weathered granite boulder in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse-grained, mottled gray-brown with rusty iron-oxide staining; constituent minerals are typically Mohs 6–7 (quartz), with vitreous to pearly luster and no consistent cleavage as a whole rock.
Formation & geological history
Intrusive magma cooled slowly underground, allowing visible crystals to grow; the image alone cannot establish its age or source, and granite occurs in continental crust of many ages.
Uses & applications
Granite is widely used as dimension stone, paving, countertops, aggregate, and decorative landscaping stone.
Geological facts
The rusty surface color is likely weathering of iron-bearing minerals rather than the rock’s original overall color.
Field identification & locations
The coarse interlocking grains and quartz-feldspar appearance are consistent with granite, but the wet, weathered surface prevents confident identification from the image alone. Granite is common worldwide in exposed continental batholiths and outcrops.
