igneous
Polished red-speckled granite or granitic pebble
Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectMedium- to coarse-grained, reddish-brown and gray, with a speckled appearance and dull to slightly vitreous luster; hardness about 6–7 Mohs, massive with no cleavage as a whole, and specific gravity roughly 2.6–2.8.
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Physical properties
Medium- to coarse-grained, reddish-brown and gray, with a speckled appearance and dull to slightly vitreous luster; hardness about 6–7 Mohs, massive with no cleavage as a whole, and specific gravity roughly 2.6–2.8.
Formation & geological history
Intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events. The rounded shape indicates transport and abrasion in a stream, beach, or glacial deposit.
Uses & applications
Used as dimension stone, countertops, monuments, aggregate, landscaping stone, and decorative polished material; this small pebble has mainly educational or modest collecting value.
Geological facts
Visible reddish feldspar, pale quartz, and darker mafic minerals are typical of granite. The image alone cannot distinguish granite confidently from similar granitic rocks such as granodiorite or rhyolite.
Field identification & locations
Identify it by interlocking visible crystals, quartz’s glassy appearance, feldspar’s pink/red color, and resistance to scratching; a steel nail usually does not scratch it. Common worldwide, especially in continental mountain belts and exposed plutons.
