Bertrandite (rare locality specimen) (ex Kay Robertson Collection)

Item Description

Mt Antero is famous for beryllium-bearing minerals like Beryl and Phenakite, but Bertrandite is one of the hardest species to find from this famous old locality. This miniature specimen hosts several micro tabular crystals of beige to white / colorless colored Bertrandite which are nestled into little vugs among a mixture of Smoky Quartz, Microcline and blue Aquamarine. The little red arrows on the specimen indicate where the Bertrandites can be found. They must be viewed with magnification, but they are very attractive once you get in there with a loupe or preferably under the microscope. It's very nearly impossible to get your hands on a piece of Bertrandite from this locality, and if you collect rare minerals or species from Colorado, do not pass this one up. Ex Kay Robertson Collection (#11296). Kay was a prominent California collector, who specialized in European classics. She nearly lived 100 years from April 1920 - March 2020. See the article in the March-April, 2007 Mineralogical Record ( https://www.mineralogicalrecor... ), and the 50+ page article in the German Magazine "Mineralien Welt" November-December 2017.