igneous
Pink granite pebble
Granite, predominantly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, pink-and-gray, with a granular texture and glassy-to-dull luster; typical hardness is about 6–7 Mohs, no consistent cleavage as a whole, and specific gravity about 2.6–2.7. The rounded shape indicates natural water or abrasion, though the surface appears polished or weathered.
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Physical properties
Coarse-grained, pink-and-gray, with a granular texture and glassy-to-dull luster; typical hardness is about 6–7 Mohs, no consistent cleavage as a whole, and specific gravity about 2.6–2.7. The rounded shape indicates natural water or abrasion, though the surface appears polished or weathered.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep underground, commonly millions to billions of years old; later uplift and erosion exposed it. Common sources include continental shields, mountain batholiths, and glacial or stream deposits.
Uses & applications
Used extensively for countertops, monuments, building stone, aggregate, and landscaping; attractive polished pieces are collected but are usually low value.
Geological facts
Pink coloration generally comes from potassium-rich feldspar, while black flecks are biotite or amphibole and translucent grains may be quartz. The specimen’s exact locality and composition cannot be confirmed from the image alone.
Field identification & locations
Identify it by visible interlocking pink feldspar, gray/clear quartz, and dark mica or amphibole grains; it should feel heavy and resist scratching with a steel blade. Common worldwide, especially in granite-bearing regions.
