hey there ! nice one ... pyrite inside like we all see but not only . where is pyrite there is gold ,its been in water thats what it looks like but , then is to sharp on places . i dont think is meteorit or whatever that has been burning on a high temp ... yet this is only what i think and that doesnt mean is true . i belive if you crush it and clean it you will find some gold parts and more because it has grean and blue colors , or if you have it in vineggar then some will dissapear and you will find more about it . yet you can just keep it as a piece of natural art and wonder ! what you think is best for imagination ? ;) be blessed !