igneous
Rounded gray-green pebble, likely fine-grained volcanic rock
Possibly andesite or basalt; exact identification requires examination
AI-generated identification · may be incorrectFine-grained, pale gray-green with darker specks and a matte, weathered surface; hardness and mineral proportions cannot be determined reliably from the image. The rounded shape suggests abrasion during transport.
Identified More igneous →
Explore Rounded gray-green pebble, likely fine-grained volcanic rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Fine-grained, pale gray-green with darker specks and a matte, weathered surface; hardness and mineral proportions cannot be determined reliably from the image. The rounded shape suggests abrasion during transport.
Formation & geological history
Likely formed when volcanic lava cooled, then weathered and was rounded in a stream or other sediment-transport setting; its age and precise formation environment are unknown.
Uses & applications
Typical pebbles are used for landscaping, decorative aggregate, and collecting; this specimen shows no distinctive gem or ornamental features.
Geological facts
The smooth outline is consistent with natural water or sediment abrasion, but weathering can obscure the rock’s original texture.
Field identification & locations
Look for fine interlocking grains and test hardness or streak; a fresh broken surface and magnification would help distinguish andesite from basalt or other rocks. Common volcanic pebbles occur near volcanic regions and in river or beach deposits.
