igneous
Weathered granite boulder
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectLight gray, speckled, and dull-weathered, with visible quartz, feldspar, and dark mica or amphibole grains. Typical hardness is about 6–7 Mohs; crystals are interlocking, with no prominent cleavage as a whole rock.
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Physical properties
Light gray, speckled, and dull-weathered, with visible quartz, feldspar, and dark mica or amphibole grains. Typical hardness is about 6–7 Mohs; crystals are interlocking, with no prominent cleavage as a whole rock.
Formation & geological history
Magma cooled slowly underground, allowing crystals to grow; the boulder was later exposed and rounded by weathering or transport. Granite forms across many geological ages, commonly in continental crust.
Uses & applications
Granite is widely used for building stone, paving, countertops, monuments, and crushed aggregate; this weathered boulder is mainly decorative or a landscape stone.
Geological facts
The pale minerals are likely quartz and feldspar, while darker flecks are commonly biotite or amphibole.
Field identification & locations
Identify granite by its visible interlocking light and dark grains and lack of layering. Common worldwide; the rounded shape may reflect natural transport or prolonged weathering. Similar landscape boulders typically sell for about $20–$200, depending on size and delivery.
