igneous
Weathered granite
Granite, a quartz–feldspar–mica intrusive igneous rock
AI-generated identification · may be incorrectCoarse, mottled pale pink, white, and gray grains; typically quartz, potassium feldspar, plagioclase, and mica. Mohs hardness is about 6–7; crystals are interlocking, with no dominant cleavage in the rock as a whole. The image’s weathered surface limits confident identification.
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Physical properties
Coarse, mottled pale pink, white, and gray grains; typically quartz, potassium feldspar, plagioclase, and mica. Mohs hardness is about 6–7; crystals are interlocking, with no dominant cleavage in the rock as a whole. The image’s weathered surface limits confident identification.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. Its age depends on its source; granites occur in crust ranging from billions to millions of years old.
Uses & applications
Used for building stone, paving, countertops, monuments, and decorative aggregate; this weathered piece is mainly suitable for collecting or display.
Geological facts
Pink coloration commonly comes from potassium feldspar, while quartz appears glassy or gray. Weathering can soften and discolor the surface, obscuring the original grain pattern.
Field identification & locations
Look for interlocking grains of quartz, feldspar, and dark mica, rather than layers or rounded pebbles. Granite is widespread in continental mountain belts and ancient shields; a fresh broken surface is more diagnostic.
