igneous
Weathered granite boulder
Granite, typically quartz–alkali feldspar–plagioclase with biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, light gray to pinkish-gray, with visible interlocking crystals; vitreous quartz, feldspar cleavage, dark mica, Mohs hardness about 6–7, and specific gravity 2.63–2.75. The rounded forms and dark surface result from weathering and lichen growth.
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, light gray to pinkish-gray, with visible interlocking crystals; vitreous quartz, feldspar cleavage, dark mica, Mohs hardness about 6–7, and specific gravity 2.63–2.75. The rounded forms and dark surface result from weathering and lichen growth.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Paleozoic mountain-building events; exposed by uplift and erosion, then rounded by spheroidal weathering.
Uses & applications
Widely used as dimension stone, building stone, countertops, monuments, curbing, road aggregate, and landscaping boulders; this natural specimen has mainly geological and scenic value.
Geological facts
Granite commonly develops exfoliation and concentric weathering, producing rounded “corestones” or tors like those shown. The apparent stacked arrangement may reflect joints, frost action, or displaced blocks rather than sedimentary layering.
Field identification & locations
Identify it by coarse interlocking quartz and feldspar crystals, abundant blocky joints, and absence of foliation or bedding; common worldwide, especially in exposed crystalline uplands. Exact mineral identification requires a close, clean surface or hand lens.
