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Egg shapped rock

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I have an egg shapped rock that is very heavy, it has a black coating that if rubbed comes off. Under the layer of black ? It is gold in color and is not magnetic. It weighs a little over 5 ounces and is 4 inches x 21/2 inches. Can you tell me what this is?


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Now that is a beauty!  Looks to be all Pyrite or Chalcopyrite and garnet.  If it is pyrite, you can not scratch it with a knife blade.  Pyrite is not magnetic.

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