igneous
Weathered granite pebble
Granite, chiefly quartz (SiO₂), feldspar, and mica/amphibole
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale gray to pink-white, granular, dull to weakly vitreous, with interlocking crystalline texture and no obvious cleavage as a whole. The rounded shape and softened surface indicate water or abrasion weathering.
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Physical properties
Hardness about 6–7 Mohs; pale gray to pink-white, granular, dull to weakly vitreous, with interlocking crystalline texture and no obvious cleavage as a whole. The rounded shape and softened surface indicate water or abrasion weathering.
Formation & geological history
A coarse-grained intrusive igneous rock crystallized slowly from magma, commonly millions to billions of years ago, then exposed and rounded in stream, beach, or glacial environments. Exact age and locality cannot be determined from the image.
Uses & applications
Used extensively as building stone, dimension stone, countertops, monuments, paving, and aggregate; attractive polished pieces are collected but generally have little gem value.
Geological facts
Granite’s visible grains reflect slow underground cooling. Pink tones usually come from potassium feldspar, while dark flecks may be biotite mica, hornblende, or weathering products.
Field identification & locations
Look for distinct interlocking pale quartz/feldspar grains and scattered dark minerals; a glassy streak or uniform texture would suggest another material. Common worldwide, especially in exposed continental crust and stream gravels.
