igneous
Pink granite pebble
Granite, predominantly quartz, feldspar, and minor mica/iron oxides
AI-generated identification · may be incorrectFine- to medium-grained, rounded and weathered; salmon-pink to cream, dull earthy luster, interlocking crystalline texture, Mohs hardness about 6–7, no strong cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Fine- to medium-grained, rounded and weathered; salmon-pink to cream, dull earthy luster, interlocking crystalline texture, Mohs hardness about 6–7, no strong cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, generally during Precambrian to younger continental plutonic events; this specimen was later eroded and rounded by transport.
Uses & applications
Used as dimension stone, countertops, monuments, aggregate, and decorative landscaping material; small pebbles have modest collecting value.
Geological facts
The pink color commonly comes from potassium feldspar, while dark specks are usually biotite or amphibole and reddish staining may reflect iron oxides.
Field identification & locations
Identify it by visible pale feldspar, translucent quartz, and scattered dark minerals in a granular mosaic; common in continental mountain belts and glacial or stream gravels worldwide. A hand lens and streak, hardness, or acid tests can help distinguish it from quartz-rich sandstone.
