igneous
Granite
Coarse-grained quartz–feldspar–mica plutonic rock
AI-generated identification · may be incorrectTypically Mohs 6–7; this specimen is pale gray to cream with white feldspar, translucent-gray quartz, and dark biotite/hornblende. It has a granular texture, vitreous quartz luster, and no consistent cleavage as a whole rock.
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Physical properties
Typically Mohs 6–7; this specimen is pale gray to cream with white feldspar, translucent-gray quartz, and dark biotite/hornblende. It has a granular texture, vitreous quartz luster, and no consistent cleavage as a whole rock.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. Its rounded shape appears naturally weathered or water-worn.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; attractive pieces are collected but usually have modest value.
Geological facts
The visible interlocking crystals indicate slow underground cooling rather than volcanic eruption. Dark mineral-rich patches and irregular veins may reflect biotite concentrations or later alteration.
Field identification & locations
Identify it by visible interlocking quartz, feldspar, and dark mica crystals; a steel scratch test generally fails on quartz but may mark softer feldspar. Common worldwide, especially in continental shields and mountain belts.
