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Romanechite?

About three years ago I came across a rock near Yuma AZ with a metalic like growth in it. Some of this material also was agatized. I put it in my 14 inch rock saw and it labored through a 3x3 inch cut. The next cut the saw made it through about half way and stopped cutting. I examined the blade and all of the diamond was completely removed from the cutting edge. I sharpened the blade with several cuts through a grind stone and tried it again. The second atempt also failed. In forty years of cutting rocks I had never had this happen. I found if the the rock had enough agate mixed in, it would cut and polish into a great looking cab. Mostly black with fancy metalic inclusions that my wife claimed as hers.
I have showed this to many people with blank looks on there faces also with many sugestions and I am not sure any of them were right. A freind had them analized with these results:
Major: silica, manganese oxide and manganese silicate.
Accessory: barite (baryum sulfate) and calcium-manganese-lead-copper oxide.
Hope someone has some ideas. Don

From Don Hixson - November 28, 2007 at 11:28:57
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Message: 65595

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