igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectThe rounded specimen is mottled gray, white, and dark brown with a granular texture and no obvious cleavage. Typical granite minerals have Mohs hardness of about 6–7; granite’s specific gravity is roughly 2.6–2.7.
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Physical properties
The rounded specimen is mottled gray, white, and dark brown with a granular texture and no obvious cleavage. Typical granite minerals have Mohs hardness of about 6–7; granite’s specific gravity is roughly 2.6–2.7.
Formation & geological history
Formed when silica-rich magma cooled slowly deep in Earth’s crust, allowing visible mineral grains to grow. Granite bodies occur across many geological ages; the pebble’s age cannot be determined from the image.
Uses & applications
Granite is used for building stone, paving, countertops, monuments, and decorative aggregate; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
Granite’s contrasting light and dark grains reflect its mixture of feldspar and quartz with darker minerals such as biotite or hornblende.
Field identification & locations
Identify it by its interlocking, speckled grains and hardness; the rounded shape suggests transport by water or abrasion. Granite is common worldwide, but exact locality and composition require closer inspection.
