igneous
Weathered granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectThe specimen appears coarse-grained and mottled cream, pink, and gray, consistent with quartz and feldspar plus dark mica. Typical granite minerals have Mohs hardness around 6–7 (feldspar about 6, quartz 7); the rock has a granular texture and no prominent cleavage as a whole.
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Physical properties
The specimen appears coarse-grained and mottled cream, pink, and gray, consistent with quartz and feldspar plus dark mica. Typical granite minerals have Mohs hardness around 6–7 (feldspar about 6, quartz 7); the rock has a granular texture and no prominent cleavage as a whole.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. Granites occur in continental crust and span a wide range of geological ages; this small piece cannot be dated from the photo.
Uses & applications
Granite is widely used as dimension stone, countertops, paving, and aggregate; attractive pieces may be collected or polished.
Geological facts
Granite’s visible crystals record slow underground cooling, and its exact mineral mix varies between specimens.
Field identification & locations
Look for interlocking pale quartz and feldspar grains with scattered dark mica; the photo’s rough, irregular texture fits granite, though identification from an image is not definitive. Granite is common in continental mountain belts worldwide.
