igneous
Weathered pink granite cobble
Granite, composed mainly of quartz, potassium feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectHardness about 6–7 Mohs; gray to salmon-pink, with a dull weathered surface and granular crystalline texture. The pink areas are potassium feldspar; quartz is typically gray or translucent, and dark grains represent mica or amphibole.
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Physical properties
Hardness about 6–7 Mohs; gray to salmon-pink, with a dull weathered surface and granular crystalline texture. The pink areas are potassium feldspar; quartz is typically gray or translucent, and dark grains represent mica or amphibole.
Formation & geological history
A coarse-grained intrusive igneous rock that crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to younger continental plutonism. Its rounded form and weathering indicate transport by water, ice, or shoreline processes.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; this rounded specimen is mainly of educational or decorative interest.
Geological facts
Granite’s interlocking crystals give it substantial durability, while feldspar commonly weathers to a rough, pale surface. Pink coloration usually reflects abundant potassium feldspar rather than a separate mineral species.
Field identification & locations
Identify it by visible interlocking grains, pink feldspar, gray quartz, and scattered dark minerals; it lacks layering or strong foliation. Common in continental mountain belts, glacial deposits, river gravels, and beaches worldwide.
