igneous
Red granite (likely weathered/rounded granite)
Granite; quartz–feldspar–mica aggregate, commonly including potassium feldspar, plagioclase, quartz, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled red-brown rock with interlocking crystals and a glossy wet surface. Typical hardness is about 6–7 Mohs; nonfoliated, massive texture, no cleavage as a whole, and specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, speckled red-brown rock with interlocking crystals and a glossy wet surface. Typical hardness is about 6–7 Mohs; nonfoliated, massive texture, no cleavage as a whole, and specific gravity around 2.6–2.7.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, generally during Precambrian to Paleozoic mountain-building events. Its rounded shape likely reflects glacial transport and abrasion, plausible near 46.9°N, 71.2°W in Québec.
Uses & applications
Used as crushed stone, aggregate, building stone, monuments, countertops, paving, and landscaping. Attractive red varieties have modest decorative and collector value.
Geological facts
The red color usually comes from iron-bearing potassium feldspar, while dark grains are biotite or amphibole. The specimen appears wet or polished, which intensifies its color and luster.
Field identification & locations
Look for visible interlocking pink/red feldspar, gray translucent quartz, and black mica or amphibole; granite is not layered or foliated and does not fizz in dilute acid. Common around the Canadian Shield and glacial deposits of Québec.
