Given the name “Lost City of Bischoff” when I first found it, this is one side of a ferroan magnesite crystal that had grown up against stepped fluorite that is no longer there. The core of this specimen is a fairly thick seam of fluorite that fluoresces strongly.
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![](https://pebblecollection.com/wp-content/uploads/2023/05/ncat-EA6-Magnesite-Fluorite-Mount-Bischoff-Mine-Waratah-Tasmania-Lost-City-6mm-70-wp-1024x819.jpg)