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How do I identify volcanic rocks?

Glassy Rocks

If a rock seems to have a "glassy" texture, that is, you're pretty sure there's no mineral grains in it, it is probably a volcanic igneous rock.

Pumice is a volcanic igneous rock that is full of tiny holes and is so light small samples of it will float on water. Scoria is a glassy igneous rock that is usually dark-colored and full of dark holes.

Obsidian is a volcanic glassy rock that has no holes, and a shiny appearance, as if it were made of glass.

Comments

3/1/2007 9:15:12 AM
Tyler said:

but it has a glassy surface and a ruff surface
what wopuld it be.

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