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Posted in response to Anyone know how and why this unique rock formed? from Garth on July 15, 2012 at 23:44:53:

Re: Anyone know how and why this unique rock formed?

Hi Garth,

You've found some "Fairy Stones". These are concretions occurring in Quaternary lacustrine deposits and are considered to be calcite after clay pseudomorphs. I have pictures and some more information regarding them online at:

http://rockhounds.com/tucson_show/reports/tucson2001/p4.shtml

Excellent find!

From Bob Keller - July 16, 2012 at 00:22:50

Message: 70403



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