Like frozen ocean water- Peruvian Blue Opal. Many of these are dendritic, meaning they have fabulous 'tree-like' inclusions that are usually the result of manganese oxides or silicates.⁠  

Difficult material to source

We are showing and example cabochon we had cut from this material for our Gem Dragon Auction

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5 pieces / 25.37 grams / 5+ grams average ⁠