igneous
Exposed granitic bedrock
Granite, likely a foliated or weathered granitoid (quartz–feldspar–mica assemblage)
AI-generated identification · may be incorrectTypically coarse-grained, gray, hard (Mohs 6–7), with a crystalline texture and vitreous to dull weathered luster; quartz and feldspar provide pale grains, while mica and weathering create darker streaks. Cleavage is absent in the rock mass, though individual feldspars cleave.
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Physical properties
Typically coarse-grained, gray, hard (Mohs 6–7), with a crystalline texture and vitreous to dull weathered luster; quartz and feldspar provide pale grains, while mica and weathering create darker streaks. Cleavage is absent in the rock mass, though individual feldspars cleave.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, commonly during Precambrian to Paleozoic mountain-building; later uplift and erosion exposed the smooth bedrock surface. The image may show glacially polished or exfoliated granite.
Uses & applications
Used as crushed stone, aggregate, dimension stone, countertops, monuments, and architectural cladding; intact outcrops have mainly geological and recreational value.
Geological facts
Smooth sloping surfaces can result from glacial abrasion, sheet-jointing, or exfoliation caused by pressure release. Granite commonly weathers into blocky forms and quartz-rich sand.
Field identification & locations
Look for visible quartz, pink or white feldspar, and black mica, plus a granular interlocking texture; a hand lens helps distinguish it from dark volcanic rock. Common worldwide, especially in mountain belts and continental shields.
