A unique specimen in my experience, this is a weird bubble/dome-shaped anhydrite specimen, with garnets at its periphery! I have not seen the like from other anhydrite finds. This specimen from the Dr Miguel Romero collection was on loan exhibition to the University of Arizona Museum for over a decade, until my purchase of this collection in 2008. It was on display in special cases at the museum, and has since been featured in the book "The Miguel Romero Collection of Mexico Minerals" which we sponsored as a special supplement book (published by the Mineralogical Record in December of 2008) .