igneous
Weathered granite or granitic rock fragment
Granite; chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, mottled gray-brown specimen with dull to slightly glassy mineral surfaces; typical hardness is about Mohs 6–7, with no dominant cleavage as a whole. The visible grains and angular fracture suggest a crystalline intrusive rock, though the small image prevents precise identification.
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Physical properties
Coarse-grained, mottled gray-brown specimen with dull to slightly glassy mineral surfaces; typical hardness is about Mohs 6–7, with no dominant cleavage as a whole. The visible grains and angular fracture suggest a crystalline intrusive rock, though the small image prevents precise identification.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, allowing visible crystals to grow; granite commonly formed during Precambrian to Phanerozoic continental crust development. Surface weathering has darkened and rounded the fragment.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and crushed-stone construction material; small unattractive fragments have minimal commercial value.
Geological facts
Granite is not a single mineral but an interlocking rock composed mainly of quartz and potassium/plagioclase feldspar, often with biotite or hornblende.
Field identification & locations
Identify by visible interlocking light and dark grains, hardness, and lack of layering or vesicles; a streak test is generally unhelpful. Common worldwide, especially in continental shields and mountain belts.
