igneous
Granite (likely a weathered granite cobble)
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectGray-green, speckled, and granular with interlocking crystals; Mohs hardness about 6–7, vitreous quartz and feldspar luster, no prominent cleavage as a whole, specific gravity about 2.6–2.7. The image does not resolve the minerals well enough for a definitive identification.
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Physical properties
Gray-green, speckled, and granular with interlocking crystals; Mohs hardness about 6–7, vitreous quartz and feldspar luster, no prominent cleavage as a whole, specific gravity about 2.6–2.7. The image does not resolve the minerals well enough for a definitive identification.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing visible crystals to grow; granite bodies form across a wide range of geological ages.
Uses & applications
Widely used as dimension stone, paving, countertops, monuments, and aggregate; this small cobble is mainly of decorative or collecting interest.
Geological facts
Its light and dark speckles commonly reflect feldspar and quartz mixed with darker mica or amphibole; weathering can round granite into cobbles.
Field identification & locations
A granular, interlocking texture and mixed light/dark minerals support granite identification; similar cobbles occur in glacial deposits, stream gravels, and landscapes near granite outcrops. Confirm minerals with close inspection or a hand lens.
