igneous
Granite boulder
Granite, chiefly quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, light gray to pinkish rock with visible quartz and feldspar, dark biotite/hornblende, and weathered lichen patches; vitreous to dull luster, massive texture, Mohs hardness about 6–7, with no cleavage as a whole.
Identified More igneous →
Explore Granite boulder in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse-grained, light gray to pinkish rock with visible quartz and feldspar, dark biotite/hornblende, and weathered lichen patches; vitreous to dull luster, massive texture, Mohs hardness about 6–7, with no cleavage as a whole.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic mountain-building; exposed by uplift, erosion, and glacial or fluvial transport.
Uses & applications
Widely used for building stone, monuments, paving, countertops, aggregate, and landscaping; this large weathered boulder has modest decorative or educational value.
Geological facts
Granite’s interlocking crystals give it excellent durability and resistance to abrasion, while feldspar commonly produces the pink coloration seen on weathered surfaces.
Field identification & locations
Identify it by its coarse interlocking crystals, quartz-rich gray color, and hardness; common worldwide in continental shields and mountain belts. The image may also represent granodiorite, which is visually similar.
