like most people here I'm not into making synthetic opals and this is not the reason I share it here
I think this is the best video about opal formation & structure ever made !
this guy is doing different experiments and not only explain them but he also show amazing macro videos and pictures where you can see how silica spheres stack together and how opal is created .. which also explain how fire works and why there are different patterns
Get an expert to answer all your Opal and Gemstone questions.
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