Malachite pseudo after Azurite - USA classic
Sacramento Mine, Bisbee, Warren District, Mule Mtns, Cochise Co.
3.8 x 3 x 2.3 CM (small miniature/ large thumbnail (toenail))
Late Summer 2021
A textbook perfect pseudomorph that has the exact form of the original Azurite crystal fully altered to a velvety Malachite. A few tiny bits of Cuprite and Copper are seen with strong magnification on the gossan matrix, but overall this is all about the very fine Malachite. A classic US specimen from the Sacremento Mine at Bisbee, we are told this is from a pre 1929 collection but there are no old labels. Certainly no specimens of this quality have been found for many decades, and will not be seen again.
An unusually well-formed, sharp and distinct replacement of free-standing Azurites. Azurite pseudos were common from Tsumeb but really good ones are quite rare. The crystals here are quite slender and elongated, being over 3 CM long but the narrow dimension is just 2-3 mm wide. For such a slender and delicate mineral this is in fantastic condition. The wide faces show the classic "starbursts" of the Malachite replacements on the surface, which is especially chatoyant. The main Malachites are perfectly intact and terminated, but some smaller crystals were broken or contacted long ago, but have begun rehealing or recrystallizing. The largest crystals are also free-standing they are only attached at the base and do not lay on the matrix. An older specimen from Tsumeb that also looks a little like some of the best pseudos from the Sacramento Mine at Bisbee.