igneous
Granite
Granite, a coarse-grained intrusive felsic igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectLight gray to cream with dark mineral flecks and a granular texture; likely quartz (Mohs 7), feldspar (6), and mica (2–3). The minerals have interlocking crystals; overall luster is mostly dull to slightly vitreous, and the rounded shape suggests weathering or handling.
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Physical properties
Light gray to cream with dark mineral flecks and a granular texture; likely quartz (Mohs 7), feldspar (6), and mica (2–3). The minerals have interlocking crystals; overall luster is mostly dull to slightly vitreous, and the rounded shape suggests weathering or handling.
Formation & geological history
Granite forms when silica-rich magma cools slowly beneath the surface, allowing visible crystals to grow. Its age cannot be determined from the image; granites occur in crustal rocks ranging from ancient to geologically recent.
Uses & applications
Used as dimension stone, countertops, paving, monuments, and crushed aggregate; attractive specimens may be collected.
Geological facts
Granite’s light color and visible, interlocking grains distinguish it from many fine-grained volcanic rocks.
Field identification & locations
Look for coarse interlocking grains of pale feldspar and quartz with scattered dark mica or amphibole. Granite is widespread in continental crust and is found in many mountain ranges and shield regions.
