This stone was collected by Dad long ago since 20 years ago, I tried to find some information about this stone unfortunately could,t find any information. I will be glad if some one among the igs community help me on this misterious stone. Thanks
not sure but I am thinking fossilized coral???
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Hi I think these may be Pyrite Suns?? as they are called see website thanks.
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Yes, it is a Pyrite Sun. I have one and it’s beautiful! 
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The material in question is known as a"Pyrite Sun" and is generally found in Illinois, during the process of coal strip mining, generally at a depth of about 125 to 200 feet. Sparta, Illinois has been the production center for many years.
Getting harder to find since all of the enviromental policies have gone into effect.
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