igneous
Granite cobblestone paving
Granite, primarily quartz, feldspar, and mica; likely gray granite or granodiorite
AI-generated identification · may be incorrectMedium- to coarse-grained, gray mottled color with dark minerals, vitreous to dull luster, interlocking crystalline texture, Mohs hardness about 6–7, and no prominent cleavage as a whole rock. Individual paving blocks are sawn or split and weathered.
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Physical properties
Medium- to coarse-grained, gray mottled color with dark minerals, vitreous to dull luster, interlocking crystalline texture, Mohs hardness about 6–7, and no prominent cleavage as a whole rock. Individual paving blocks are sawn or split and weathered.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep underground, commonly during Precambrian to Phanerozoic continental magmatism. The visible blocks are quarried, cut, and used as street paving.
Uses & applications
Highly durable for cobblestone streets, curbs, paving, and building stone; attractive pieces may be used decoratively, but these are construction-grade rather than collectible specimens.
Geological facts
Granite resists abrasion and heavy traffic because of its interlocking quartz–feldspar framework. The pale crystals are usually feldspar or quartz, while black grains are commonly biotite or hornblende.
Field identification & locations
Identify it by visible granular crystals, gray speckling, and great resistance to scratching; it differs from basalt by being lighter and visibly crystalline. Common paving granites come from quarries worldwide, including Europe, China, India, and North America.
