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hoekie,
Yep, that would be the source. They alkso mention the yield of yellow to blue stone. Only .66% is yellow Coticule which explains the price.

Tony

Randy,
My research into the Belgians gives a grit size averaging 15 microns, usually 5 to 20 but most around 15. It is their odd shape, roughly a 20 sided crystal that prevents the sharp corners...