I am working on removing some stones from a cuff and have found a strange material underneath the Turquoise. Anyone want to educate me on what this is? Looks like a course white sand?? Photos below. Thanks in advance!
it is very common for a sawdust to be used, could this be a small wood chip?
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Very likely it is. I will dig out the digital microscope when I have a chance and see, but my guess is that you are spot on as usual! Thanks Jason! 
When I was being trained in AZ, small pieces of wood like this were used by the Navajo craftsman to elevate the stones.