igneous
Dark fine-grained stone pebble
Possibly basalt; identification is uncertain from the small, distant image
AI-generated identification · may be incorrectDark gray-green, dull and rounded, with no visible crystals; if basalt, typically Mohs 5–6, fine-grained, and composed mainly of plagioclase and pyroxene.
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Physical properties
Dark gray-green, dull and rounded, with no visible crystals; if basalt, typically Mohs 5–6, fine-grained, and composed mainly of plagioclase and pyroxene.
Formation & geological history
A basalt pebble would have formed as rapidly cooled lava, then been rounded by water or abrasion; basalt ranges from recent to billions of years old.
Uses & applications
Basalt is used as construction aggregate and paving stone; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
Basalt is among Earth’s most abundant volcanic rocks and also forms much of the ocean floor.
Field identification & locations
A photo cannot confirm the rock type. Look for a dense, fine-grained texture and test hardness; its original location would help narrow identification.
