igneous
Quartz-rich granite or granitic pebble
Granite; primarily quartz (SiO₂), potassium feldspar, plagioclase, and minor mica/iron oxides
AI-generated identification · may be incorrectHardness about 6–7 overall; coarse, interlocking white to pink crystals with scattered dark grains, glassy quartz luster, and no obvious cleavage as a whole rock. The rounded shape indicates natural abrasion or tumbling.
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Physical properties
Hardness about 6–7 overall; coarse, interlocking white to pink crystals with scattered dark grains, glassy quartz luster, and no obvious cleavage as a whole rock. The rounded shape indicates natural abrasion or tumbling.
Formation & geological history
Slow cooling of silica-rich magma produced the crystalline texture, typically in continental crust during Precambrian to younger geologic periods; the pebble was later weathered and transported by water or ice.
Uses & applications
Commonly used as crushed stone, aggregate, paving, building stone, and decorative landscaping material; this small specimen has modest educational or collecting value.
Geological facts
The pink color generally comes from potassium feldspar, while translucent gray areas are quartz and dark flecks may be biotite or amphibole. Exact identification is limited because the specimen is weathered and photographed without scale or tests.
Field identification & locations
Look for visible interlocking quartz and feldspar crystals, substantial hardness, and a granular texture; it should not fizz with dilute hydrochloric acid. Common in granitic terrains and river or glacial gravels.
