Matthew Boeck's Blog
Coal Ball Link
30th Mar 2009
I was doing new research and found an interesting link with Spherulitic structuresa in them they were coal balls and appearently were wood that werelter replaced with otherminerals the reaserch was quite extensive and complete here is the link: http://spectrum.troy.edu/~barwood/petro3.htm [Link Broken? Jul 2014] -Matt b.
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Locality Updated: Gruvdalen Mine (Skeppsdal), Österåker, Uppland, SwedenFrom Knut Edvard Larsen, 24th Jul 2014 10:39:15