igneous
Granite fragment
Felsic intrusive igneous rock; mainly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled gray-green and white appearance with a granular texture; quartz hardness 7 and feldspar about 6, with generally vitreous to dull luster and no dominant cleavage as a whole rock. The visible grains suggest interlocking crystalline structure.
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Physical properties
Coarse-grained, speckled gray-green and white appearance with a granular texture; quartz hardness 7 and feldspar about 6, with generally vitreous to dull luster and no dominant cleavage as a whole rock. The visible grains suggest interlocking crystalline structure.
Formation & geological history
Formed by slow cooling and crystallization of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events. Exact age cannot be determined from the photograph.
Uses & applications
Widely used for countertops, building stone, monuments, paving, aggregate, and decorative landscaping; this small fragment has negligible commercial value.
Geological facts
Granite is a rock rather than a single mineral, and its individual crystals are typically visible without magnification. Weathering commonly produces rusty stains from oxidation of iron-bearing minerals.
Field identification & locations
Identify it by its interlocking coarse grains, pale quartz/feldspar, and darker mica or amphibole; it is common in continental crust and granite quarries worldwide. A hand lens, streak test, and fresh broken surface would improve confidence.
