I was walking on the beach and picked up what I thought was a black rock but was surprised by how light it was. I figured it was charcoal from a fire but it didn't break when I tried to snap it.

Pictures of it.
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http://img31.imageshack.us/img31/9530/img20110424145927.jpg
http://img856.imageshack.us/img856/1720/img20110424150105.jpg

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