Denningite is found ONLY at this mine, the type locality for the species recognized in 1961 from material found in the 1940s-1950s. One of the surprises of 2007 for rarities was the reworking of the famous old Bambolla mine in the Moctezuma tellurium complex for specimens, by several European-led collecting teams. Many specimens were then sold at Munich 2008 and this year in Tucson. This is a very rich specimen with vitreous, very nice yellow, elongated crystals of denningite admixed with microcrystalline or acrystalline yellow tellurite. It is rich and colorful throughout the display face. I am told that mixed with the denningite is often spiroffite, and the two are often mislabeled one way or the other, but this has not been determined for this specimen. (TYPE LOCALITY)