Diedra 1 Posted December 3, 2018 Share Posted December 3, 2018 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? Quote Link to post Share on other sites
Morlock 1,607 Posted December 3, 2018 Share Posted December 3, 2018 Most likely pyrite or chalcopyrite. Quote Link to post Share on other sites
Diedra 1 Posted December 3, 2018 Author Share Posted December 3, 2018 Thank you. Is pyrite magnetic? Quote Link to post Share on other sites
4meter 186 Posted December 3, 2018 Share Posted December 3, 2018 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. Quote Link to post Share on other sites
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