Vopros Posted December 12, 2023 Share Posted December 12, 2023 This is a boulder opal from Australia. The dimensions in mm are 8 x 6 x 2. The pictures are taken under a microscope, and the resolution is low. in the images #1 and 3 you also could see the background, which IMO is also unusual. I wonder if the inclusion is organic, and if not, what mineral could it be? Thanks! Link to comment Share on other sites More sharing options...
Isotelus2883 Posted December 13, 2023 Share Posted December 13, 2023 I think the probablity is that it is a botryoidal mineral growth that formed before the opal. 5 Link to comment Share on other sites More sharing options...
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