Tennantite (excellent crystals) (ex Kay Robertson Collection)

Item Description

An excellent large thumbnail / toenail sized piece of Tennantite from the world famous Tsumeb Mine. Typically Tennantite crystals from this locality are regarded among the best examples of the species ever found. This particular specimen is a beautiful group of fine quality, very sharp, well-formed, tetrahedral crystals of a black-grey hue measuring up to 2.0 cm on edge free of matrix. I love how the piece has an almost "rosette"-esque formation. No damage that I can see with the naked eye, and just excellent quality all around. It's not easy to get good Tsumeb Tennantites these days, especially in such attractive crystals. Ex Kay Robertson Collection (#7021). 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.mineralogicalrecord.com/pdfs/Kay%20Robertson%20Collection.pdf ), and the 50+ page article in the German Magazine "Mineralien Welt" November-December 2017.