do any of you know a good source to buy crushed/powdered turquoise? I have a chunck of sycamore that will need several cracks filled and I thought I would try dressing it up. Searchs online were harder than I thought it would be. nothing on the big auction site and the only retailer I found had it at $10 per ounce (thought that was high but maybe not)---as usual help is appreaciated