igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectRounded, mottled gray, white, and dark minerals with a granular texture and dull to slightly sparkly luster. Typical hardness is about 6–7 Mohs; crystals are interlocking, with no prominent cleavage in the rock as a whole.
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Physical properties
Rounded, mottled gray, white, and dark minerals with a granular texture and dull to slightly sparkly luster. Typical hardness is about 6–7 Mohs; crystals are interlocking, with no prominent cleavage in the rock as a whole.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing visible crystals to grow; granites range from Archean to recent geologic ages. The pebble’s smooth shape likely formed through transport and abrasion in water or glacial deposits.
Uses & applications
Granite is widely used for building stone, paving, countertops, and monuments; this small rounded pebble is mainly suitable for collecting or decoration.
Geological facts
The pale grains are likely feldspar and quartz, while darker grains may be biotite or amphibole; a photo cannot determine exact mineral proportions.
Field identification & locations
Look for a hard, speckled rock with interlocking light and dark crystals; common in river gravels and regions underlain by granite. The specimen’s source cannot be established from appearance alone.
