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Thank you one and all for your replies. My dad has the rock so I'll ask him for more information based on everyone's responses. @Goldfreak I haven't put a flame to it but I'll ask my father to do so and report the outcome but I expect it to have no effect. I'm not sure whether the orange bits...

Hi all, My father found this rock in his back yard the other day and would like to know what it is as it looks completely foreign to him. Thanks.