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These vary in thickness - from 4.6mm (Noorena) - 7.06mm (Verdite). Most fall in the 5.5-6.5mm range. Sizes vary - smallest is 1.25"x1.6"(Graveyard) the largest is 3.25"x1.75" (Binthalia= triangle). All of this is older material obtained from a lapidary collector.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.