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A classic Mexican pseudomorphosis. Stibiconite appears as a brilliant coating on well-formed prismatic stibnite crystals of very good size. The terminations of the crystals are well defined, while on the back of the specimen they are flat due to being in contact with the wall of the geode or cavity from which the piece was extracted. Stibiconite was for a long time an acknowledged species, but is now questionable, in line with the revised nomenclature of the minerals of the pyrochlore supergroup. These specimens are very difficult to see on the market.
Stibiconite species totally replacing a stibnite crystal, very elongated, with multiple terminations and partially covered by scalenohedral calcite crystals with staggered growths. A classic of Mexican mineralogy. It belongs to the former Joan Astor collection (Barcelona) with a handwritten and typewritten label.