igneous
Tumbled red granite
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled reddish-brown, gray, and pale crystals with a vitreous-to-dull polish; quartz hardness 7, feldspars about 6, mica 2–3 Mohs. Interlocking crystals have no prominent cleavage in the whole rock.
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Physical properties
Coarse-grained, mottled reddish-brown, gray, and pale crystals with a vitreous-to-dull polish; quartz hardness 7, feldspars about 6, mica 2–3 Mohs. Interlocking crystals have no prominent cleavage in the whole rock.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible crystals to grow; granite bodies occur across many geological ages, commonly billions to tens of millions of years old.
Uses & applications
Used as dimension stone, countertops, paving, and decorative aggregate; small polished pieces are sold as inexpensive curios or craft material.
Geological facts
The reddish color typically comes from iron-bearing potassium feldspar, while the light reflective grains are commonly quartz or feldspar.
Field identification & locations
Identify by its speckled, interlocking crystals and lack of layering; granite is widespread in continental crust. This piece appears rounded and polished, likely tumbled.
