igneous
Weathered granite fragment
Granite; primarily quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled pale gray to tan rock with a granular texture and dull to slightly glassy luster; individual crystals are visible. Hardness is approximately 6–7 Mohs; cleavage occurs in feldspar, while quartz has none. Exact mineral proportions are uncertain from the image.
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Physical properties
Coarse-grained, speckled pale gray to tan rock with a granular texture and dull to slightly glassy luster; individual crystals are visible. Hardness is approximately 6–7 Mohs; cleavage occurs in feldspar, while quartz has none. Exact mineral proportions are uncertain from the image.
Formation & geological history
Granite forms when silica-rich magma cools slowly deep within continental crust, producing interlocking crystals. It can range from Precambrian to Cenozoic in age and is later exposed by uplift and erosion.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and building material; ordinary fragments have little jewelry or collector value.
Geological facts
The pale, coarse texture and scattered dark grains are typical of granite, though granodiorite or weathered gneiss could look similar. A fresh surface and hand lens would improve identification.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Field tests include visible interlocking grains, inability to scratch quartz with a steel nail, and lack of layering or foliation.
