igneous
Weathered granite pebble
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectRounded, coarse-grained, speckled gray-brown pebble with a granular texture and no obvious cleavage. Typical granite minerals have Mohs hardness of about 6–7 (quartz), with feldspar around 6; the rock’s specific gravity is roughly 2.6–2.7.
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Physical properties
Rounded, coarse-grained, speckled gray-brown pebble with a granular texture and no obvious cleavage. Typical granite minerals have Mohs hardness of about 6–7 (quartz), with feldspar around 6; the rock’s specific gravity is roughly 2.6–2.7.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. It may be hundreds of millions to billions of years old; the pebble’s age and source cannot be determined from the image.
Uses & applications
Granite is widely used as building and paving stone, countertops, aggregate, and decorative stone; this small pebble is mainly a teaching or collection specimen.
Geological facts
Granite’s visible grains record slow cooling deep in Earth’s crust. Weathering and transport can round granite fragments into pebbles.
Field identification & locations
Look for interlocking light quartz and feldspar grains with darker mica or other minerals; granite is common in continental crust and stream or beach gravels. The image supports a granite-like identification, but a close-up or hardness test would help confirm it.
