igneous
Black beach pebble (likely basalt)
Fine-grained basalt; exact identification cannot be confirmed from the image
AI-generated identification · may be incorrectDark gray to black, smooth and rounded, with a dull to slightly waxy surface and possible fine-grained texture. Basalt is typically Mohs 6, composed mainly of plagioclase and pyroxene; crystal structure is too fine to distinguish here.
Identified More igneous →
Explore Black beach pebble (likely basalt) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark gray to black, smooth and rounded, with a dull to slightly waxy surface and possible fine-grained texture. Basalt is typically Mohs 6, composed mainly of plagioclase and pyroxene; crystal structure is too fine to distinguish here.
Formation & geological history
Likely an old volcanic rock rounded by water or abrasion. Basalt forms when lava cools at or near the surface; its age and specific origin cannot be determined visually.
Uses & applications
Commonly used as landscaping stone, aggregate, and decorative material; this pebble is mainly suitable for collecting or display.
Geological facts
Basalt is one of Earth’s most abundant volcanic rocks and also makes up much of the ocean floor.
Field identification & locations
A dark, dense pebble with fine grains and no obvious layers is consistent with basalt, though other dark rocks can look similar. Common along beaches and riverbeds; a fresh broken surface or mineral testing would help confirm it.
