igneous
Weathered granite
Granite, primarily quartz, alkali feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled pink, gray, and dark brown; vitreous quartz and dull feldspar, with no obvious cleavage as a whole rock. Individual minerals are typically Mohs 6–7 (quartz), 6–6.5 (feldspar), and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, speckled pink, gray, and dark brown; vitreous quartz and dull feldspar, with no obvious cleavage as a whole rock. Individual minerals are typically Mohs 6–7 (quartz), 6–6.5 (feldspar), and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in the continental crust, generally during Precambrian to Phanerozoic mountain-building events. The reddish surface reflects iron oxidation and weathering.
Uses & applications
Used widely as dimension stone, countertops, monuments, building facades, aggregate, and landscaping rock; this small weathered specimen has modest decorative or educational value.
Geological facts
Granite’s visible interlocking crystals record slow underground cooling. Pink coloration commonly comes from potassium feldspar, while dark grains are usually biotite or amphibole.
Field identification & locations
Identify it by its coarse interlocking grains, pink feldspar, translucent gray quartz, and dark mica/amphibole; it will not fizz with dilute hydrochloric acid. Common worldwide, especially in continental shields and mountain belts.
