igneous
Granite (weathered fragment)
Granite; chiefly quartz, alkali feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-pink rock with visible interlocking crystals and moderate vitreous-to-dull luster; typical hardness is about 6–7 Mohs, with no dominant cleavage as a whole, though feldspar and mica cleave. The image is insufficient for precise mineral proportions or confirmation.
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Physical properties
Coarse-grained, speckled gray-pink rock with visible interlocking crystals and moderate vitreous-to-dull luster; typical hardness is about 6–7 Mohs, with no dominant cleavage as a whole, though feldspar and mica cleave. The image is insufficient for precise mineral proportions or confirmation.
Formation & geological history
An intrusive felsic igneous rock that crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events; surface weathering rounded and altered this fragment.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and building stone; attractive hand specimens have modest collecting value.
Geological facts
Granite’s visible crystals record slow underground cooling, unlike fine-grained volcanic rhyolite. Dark flakes are likely biotite or amphibole, while pale grains are feldspar and quartz.
Field identification & locations
Identify it by its coarse interlocking texture, mixed white/gray/pink minerals, and lack of layering or foliation; common in continental shields, mountain belts, quarry waste, and glacial deposits. A scratch test and fresh broken surface improve confidence.
