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Posted in response to Re: Help to identify - Again from Alan on June 05, 2007 at 00:07:50:

Re: Re: Help to identify - Again

Hi Alan,

Yes, I can indent the side with a knife or file, but does not give any plastic, pine or similar smells with hot needle. Also does not float in salt bath suspension (unless my solution is too weak). I asked before about this and thanks to the rockhounds of the forum, believe it to be Carnelian, but still wondering if could be somethig else, as does not match any photos I could find of similar. I took it to a local gemologist, and she had no idea what it could be. What about a common non destructive testing technique called PMI ( Positive Material Identification)I have used this for ferromagnetic metals before but not rocks...anyone with experience with this? It uses x-ray flourescence to identify basic carbon, silica and maganese content. FYI, sample came from a North Saskatchewan gravel pit. For hardness could I use a Brinell gauge or Vickers machine to determine? What is liklihood of causing cracks through the viens with this method? I'm lost.........................................................

From Ryan - June 05, 2007 at 01:55:14
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Bob Keller