igneous
Weathered granite fragment
Granite; primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse, speckled gray-brown material with vitreous quartz, pale feldspar, and dark mica; typical hardness 6–7 Mohs, nonmetallic luster, and no prominent cleavage as a whole. The small specimen appears weathered and possibly iron-stained.
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Physical properties
Coarse, speckled gray-brown material with vitreous quartz, pale feldspar, and dark mica; typical hardness 6–7 Mohs, nonmetallic luster, and no prominent cleavage as a whole. The small specimen appears weathered and possibly iron-stained.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep within continental crust, commonly during Precambrian to Phanerozoic mountain-building events; its age cannot be determined from the image. Weathering and erosion produced this loose fragment.
Uses & applications
Used extensively as dimension stone, countertops, paving, monuments, and aggregate; small unexceptional fragments have little jewelry or collector use.
Geological facts
Granite is an intrusive igneous rock with interlocking crystals large enough to see without magnification. Its quartz–feldspar–mica texture distinguishes it from fine-grained volcanic rocks.
Field identification & locations
Identify it by visible interlocking grains, abundant light feldspar/quartz, and scattered dark mica; it should not fizz with dilute acid. Common worldwide, especially in continental shields and mountain ranges; exact identification may require a fresh surface or thin section.
