Diopside

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Diopside, 2.8 cm, from the Samax mine, Merelani Hills, Umba Valley, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania. Ex Daniel Trinchillo (who wrote “This is among the finest 5 pieces found at the mine”); ex Jim Houran. It was part of the 2010 Desautels Award winning exhibit, and the special exhibit of “Connoisseur Thumbnails” at the 2013 Tucson Gem and Mineral Show. Illustrated in Mineralogical Record (May–June 2013), Minerals: The Collectors Newspaper (2014), and Cairncross (2019) Minerals & Gemstones of East Africa. Jeff Scovil photo.