Rock Detectives!

Help me figure out what kind of rock this is! I work in a geology lab at a museum (even thought I am not a geologist) and got a call from a man asking to help identify a rock. Since none of the geologists were in, I thought I would give it a try, since I have some background in geology. I think it's a pumice rock fuzed with obsidian. WHAT DO YOU THINK!?! Help me identify this rock!

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Comment by Sanjoy Som on July 29, 2013 at 10:12am

Woah interesting! I think this may is a basalt that has been polished by water transport. the holes are gas bubbles (vesicles), and the glassy rind suggests that the lava was quickly cooled because of contact with water.

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