igneous
Weathered quartz-rich granite
Granite, primarily quartz (SiO₂), feldspar, and minor biotite/mica or iron oxides
AI-generated identification · may be incorrectUsually coarse-grained with white to pink feldspar, translucent gray quartz, and dark mica; vitreous to dull luster, no consistent cleavage as a whole, Mohs hardness about 6–7, and specific gravity around 2.6–2.7. The rounded shape and softened surface indicate river or glacial abrasion and weathering.
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Physical properties
Usually coarse-grained with white to pink feldspar, translucent gray quartz, and dark mica; vitreous to dull luster, no consistent cleavage as a whole, Mohs hardness about 6–7, and specific gravity around 2.6–2.7. The rounded shape and softened surface indicate river or glacial abrasion and weathering.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic intrusive events; the specimen’s exact age cannot be determined visually. Uplift, erosion, and transport produced its rounded form.
Uses & applications
Used widely as building stone, countertops, monuments, aggregate, and landscaping rock; this ordinary rounded piece has little jewelry value.
Geological facts
Pink coloration generally comes from potassium feldspar, while dark patches may be biotite, amphibole, or weathering products. The image does not show enough detail to distinguish granite confidently from quartz monzonite or granitic gneiss.
Field identification & locations
Look for interlocking visible grains of quartz, feldspar, and dark minerals; quartz scratches glass, while feldspar is commonly near Mohs 6. Common in continental mountain belts and glacial or river gravels worldwide.
