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India is one of the most notable sources of heulandite in the world
Trancas geodes formed inside volcanic rock as mineral rich groundwater slowly deposited layers of silica into hollow cavities
India is one of the world's most notable sources for prehnite and apophyllite combination specimens
Chalcedony
Green Heulandite (#1141) Barite India is one of theApproximate Size: 5. 25 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.
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