igneous
Weathered granite fragment
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray-white, with a dull to slightly sparkly luster; likely Mohs hardness 6–7, no consistent cleavage as a whole, and specific gravity about 2.63–2.75. The visible granular texture suggests interlocking crystals of quartz and feldspar, possibly with minor mica.
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Physical properties
Coarse-grained, pale gray-white, with a dull to slightly sparkly luster; likely Mohs hardness 6–7, no consistent cleavage as a whole, and specific gravity about 2.63–2.75. The visible granular texture suggests interlocking crystals of quartz and feldspar, possibly with minor mica.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep within continental crust, commonly during Precambrian to younger mountain-building events; this fragment was later exposed and weathered. Exact age and locality cannot be determined from the photograph.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and building material; this small fragment has mainly educational or modest collecting value.
Geological facts
Granite commonly shows a “salt-and-pepper” texture caused by contrasting light feldspar/quartz and dark mica or amphibole. Its granular crystals distinguish it from fine-grained volcanic rocks such as rhyolite.
Field identification & locations
Identify it by its visible interlocking grains, pale feldspar, glassy quartz, and occasional dark mica; a steel nail should not easily scratch it, while quartz can scratch glass. Common worldwide, especially in exposed continental shields and mountain belts.
