igneous
Granite (rounded cobble)
Granite; chiefly quartz, potassium feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled cream, pink, and gray; interlocking crystals with a mostly granular texture. Mohs hardness about 6–7; vitreous quartz and feldspar are typically non-cleaving to weakly cleaved; specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, mottled cream, pink, and gray; interlocking crystals with a mostly granular texture. Mohs hardness about 6–7; vitreous quartz and feldspar are typically non-cleaving to weakly cleaved; specific gravity around 2.6–2.7.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible crystals to grow. Granite bodies occur in rocks of many geological ages; this specimen’s age and exact source cannot be determined from the image.
Uses & applications
Used as building and paving stone, countertops, monuments, and landscape stone; polished pieces are also collected.
Geological facts
Granite is a rock, not a single mineral, and its composition varies. The rounded shape likely resulted from weathering or transport, though the photo alone cannot establish its history.
Field identification & locations
Look for visible interlocking light feldspar and quartz with scattered darker mica, and no layering. Granite occurs worldwide, especially in continental crust and mountain belts.
