igneous
Weathered granite (likely pink granite)
Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/amphibole
AI-generated identification · may be incorrectMedium- to coarse-grained, pink-gray and black mottling, dull to weakly crystalline luster, interlocking crystals, and no obvious cleavage as a whole; hardness about 6–7 Mohs, specific gravity roughly 2.6–2.7.
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Physical properties
Medium- to coarse-grained, pink-gray and black mottling, dull to weakly crystalline luster, interlocking crystals, and no obvious cleavage as a whole; hardness about 6–7 Mohs, specific gravity roughly 2.6–2.7.
Formation & geological history
An intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in Earth’s crust, commonly during Precambrian to younger continental episodes. The rounded surface reflects weathering or abrasion.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; ordinary hand specimens have little commercial value.
Geological facts
Pink coloration usually comes from potassium feldspar, while dark patches are biotite or amphibole and translucent grains are quartz.
Field identification & locations
Identify it by visible interlocking pink/white feldspar, gray glassy quartz, and black mica or amphibole; it commonly occurs in continental mountain belts and exposed batholiths. The image could also represent a closely related granitic gneiss, but foliation is not clear.
