igneous
Weathered granite-like rock
Granite or granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; coarse, granular texture with pale gray/tan feldspar, translucent quartz, and dark mica or hornblende. Typically vitreous quartz luster, no consistent cleavage as a rock, and specific gravity around 2.6–2.8.
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Physical properties
Hardness about 6–7 Mohs; coarse, granular texture with pale gray/tan feldspar, translucent quartz, and dark mica or hornblende. Typically vitreous quartz luster, no consistent cleavage as a rock, and specific gravity around 2.6–2.8.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, probably during a Precambrian to younger continental intrusive event; surface weathering rounded and altered the specimen.
Uses & applications
Common granite is used as crushed aggregate, building stone, countertops, monuments, and dimension stone; ordinary hand specimens have little commercial value.
Geological facts
The granular crystals indicate slow cooling rather than volcanic eruption. Brown coloration likely reflects oxidation and weathering of iron-bearing minerals or feldspar.
Field identification & locations
Identify it by visible interlocking crystals: pink/cream feldspar, gray glassy quartz, and scattered dark grains; it should not fizz with dilute hydrochloric acid. Common worldwide, especially in continental shields and mountain batholiths.
