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Posted in response to Polishing Geode and Thunder Egg halves from Marlin523 on December 22, 2008 at 17:56:28:

Re: Polishing Geode and Thunder Egg halves

I use a high speed dry sander such as the one sold by Richardson's Ranch. I use a 3 step sandpaper: 100, 220, 400. I then polish on a 12" leather wheel with cerium oxide. Keep the t-egg cool, otherwise pieces will break off from the heat buildup. This method is not real good for opalized eggs. They fracture and break too easily, but the agate centers turn out good.

From Randy Vandehey - December 23, 2008 at 23:04:14
Email: randys_rocks[ ]clearwire.net

Message: 67282



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