igneous
Black-and-white speckled granite pebble
Granite, a coarse-grained felsic intrusive igneous rock, composed mainly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectThe rounded pebble has a light gray-white groundmass with black mineral speckles and a granular, nonmetallic luster. Typical granite minerals have hardness around 6–7 Mohs; individual crystals are interlocking and show no consistent cleavage at the rock scale.
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Physical properties
The rounded pebble has a light gray-white groundmass with black mineral speckles and a granular, nonmetallic luster. Typical granite minerals have hardness around 6–7 Mohs; individual crystals are interlocking and show no consistent cleavage at the rock scale.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. Its age depends on its source; rounded pebbles are commonly produced by prolonged river, beach, or glacial transport and erosion.
Uses & applications
Granite is widely used for countertops, building stone, paving, monuments, and landscaping; this small pebble is mainly suitable for collecting or decoration.
Geological facts
The black flecks are commonly biotite mica or hornblende, while the pale grains are quartz and feldspar. The specimen’s rounded shape reflects abrasion during transport.
Field identification & locations
Identify it by its visible interlocking light and dark grains, with no layering or strong foliation. Granite is common worldwide; the photo alone cannot establish its exact locality or mineral proportions.
