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Sat 3 Jan, 2015 07:29 pm
I have rock from crater of the moon national park, Idaho, and was wondering could somebody tell me what it is. It is a shiny pitch black in colour, very porous, light, and brittle. There is also very vibrant purple, silver and gold colouration which sparkles under light. I know it is volcanic but i am wondering what kind?? Thank you in advance, Brian