igneous
Granite fragment
Granite; chiefly quartz, alkali feldspar, and plagioclase, with minor mica or amphibole
AI-generated identification · may be incorrectCoarse-grained, light tan granular appearance with vitreous quartz and feldspar luster; hardness about 6–7 Mohs, no cleavage as a whole, and specific gravity roughly 2.63–2.75.
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Physical properties
Coarse-grained, light tan granular appearance with vitreous quartz and feldspar luster; hardness about 6–7 Mohs, no cleavage as a whole, and specific gravity roughly 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to younger continental mountain-building events.
Uses & applications
Used widely as building stone, countertops, monuments, paving, and aggregate; this small fragment has minimal commercial value.
Geological facts
Individual mineral grains are visible because underground cooling allowed large crystals to grow. Its tan color commonly reflects potassium feldspar and weathering or iron staining.
Field identification & locations
Identify it by its interlocking visible grains, hard scratch-resistant surface, quartz, and feldspar; unlike sandstone, it lacks sedimentary layering. Common worldwide, especially in continental shields and mountain belts.
