New Members Rhena Posted December 11, 2022 New Members Share Posted December 11, 2022 1 Link to comment Share on other sites More sharing options...
Rockwood Posted December 12, 2022 Share Posted December 12, 2022 This must be a colonial rugose coral. I somehow doubt it is quartz, but can't say for certain. The blue color is often an indication of copper compounds. Link to comment Share on other sites More sharing options...
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