Weird Bubble Rock

firehorse12

Sr. Member
Sep 3, 2012
275
27
Texas
Primary Interest:
All Treasure Hunting

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Got a unglazed piece of porcelain? Rub one of the edges which is not so easy to see against it. As if drawing.
I bet you'd get a yellowish-brown or brownish streak. My guess is limonite.
 

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