igneous
Red granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and mica, with iron-oxide staining
AI-generated identification · may be incorrectCoarse-grained, reddish-pink and gray, with a granular texture and dull to glassy mineral luster; typical hardness is about 6–7 Mohs. The red color usually comes from potassium feldspar and oxidation of iron-bearing minerals; no obvious cleavage as a whole rock, though feldspar and mica cleave.
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Physical properties
Coarse-grained, reddish-pink and gray, with a granular texture and dull to glassy mineral luster; typical hardness is about 6–7 Mohs. The red color usually comes from potassium feldspar and oxidation of iron-bearing minerals; no obvious cleavage as a whole rock, though feldspar and mica cleave.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, allowing visible crystals to grow; most granite formed during Precambrian to Phanerozoic continental plutonism. Surface weathering may have produced the rough, oxidized appearance.
Uses & applications
Used as dimension stone, building aggregate, monuments, countertops, and landscaping rock; attractive pieces may be collected but are generally low value.
Geological facts
Granite is an intrusive igneous rock, and its individual crystals commonly include quartz, potassium feldspar, plagioclase, and biotite or hornblende.
Field identification & locations
Identify it by interlocking pink feldspar, gray or translucent quartz, and dark mica/hornblende; a glassy scratch and lack of fizz with dilute acid support granite. Common worldwide in continental mountain belts and exposed shields.
