igneous
Small dark pebble, possibly basalt
Unidentified fine-grained mafic rock; basalt is a tentative visual match
AI-generated identification · may be incorrectDark brown-black, rounded, and apparently fine-grained; hardness, luster, and mineral composition cannot be determined reliably from this image.
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Physical properties
Dark brown-black, rounded, and apparently fine-grained; hardness, luster, and mineral composition cannot be determined reliably from this image.
Formation & geological history
If basalt, it formed when mafic lava cooled rapidly at or near Earth’s surface; its age and geological source are unknown.
Uses & applications
Small pebbles are mainly used for collecting or decoration; basalt is also used as aggregate and building stone.
Geological facts
The rounded shape suggests abrasion during transport, such as in a stream or along a shore, but does not establish its origin.
Field identification & locations
A photo alone cannot confirm basalt; inspect a fresh surface for fine grains and check whether it is unusually heavy or magnetic. Dark pebbles can also be other rocks or industrial material.
