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This Uruguayan amethyst is set on a custom-made metal stand
the interior cannot be seen or guaranteed before breaking them open
the base has been cut for stability
primarily within the cavities of volcanic rocks like basalt
Green Heulandite (#1140) Ammonite This Uruguayan amethyst is setApproximate Size: 2. 9 inches Green Heulandite mineral specimen. Location: Aurangabad Maharashtra, India. Facts: Heulandite has a sheet like open framework structure, classified as a tectosilicate, where it's structure is composed of interconnected six membered rings of silicate tetrahedra, creating channels within the crystal that allow it to act as a Zeolite, capable of exchanging cation like sodium, calcium, and potassium within its structure.
