Volcanic Rock Identifier
Basalt
A dark, fine-grained volcanic rock formed from rapidly cooling lava. It's the most common rock type in the Earth's crust.
Pumice
A light-colored, vesicular volcanic rock formed from rapidly cooling lava with trapped gas bubbles. It's so light it can float on water.
Obsidian
A dark, glassy volcanic rock formed from rapidly cooling lava with minimal crystal growth. It's known for its sharp edges and was used for tools by ancient civilizations.
Scoria
A dark, vesicular volcanic rock formed from gas-rich lava. It's similar to pumice but generally denser and darker in color.