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.

Specimen of Mexican banded opal. An old piece from the Manchion collection acquired in 1991.

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.

Rich group of danburite crystals, transparent to translucent, with developed prism and defined faces and edges. Some with nicks in the terminal parts, but without affecting the whole. They are disposed on a matrix with pyrite and sphalerite crystals. Brightness, snowy white, very aesthetic and ancient specimen.

A huge size danburite specimen totally different from what we can usually find from this Mexican locality. Formed by a large group of prismatic crystals, which have different faces of the orthorhombic prism, with very defined terminal faces. Good transparency in most crystals, others are translucent. They are disposed on a matrix of good size chalcopyrite crystals, some of them partially covered by iridescent bornite. A museum piece.

A nice cluster of topaz crystals with very well defined faces and edges, with a developed prism, cuted by the basal pinacoid and other order prism faces on top. The tile color presents zoning, more intense in pinacoidal faces. From transparent to translucent, with good brilliance. With an aesthetic opal-AN aggregate on one of the main crystals. Opal presents intense green fluorescence under SW-UV light. Rutile inclusions can be observed as thin needles in the topaz prisms and in the opal. One of the topaz crystals presents a minor damage. They are very aerial disposed on a rhyolite matrix. Nice miniature. It is very interesting the origin of the word tepetate (tepetatl).

A nice cluster of topaz crystals with very well defined faces and edges, with a developed prism, cuted by the basal pinacoid and other order prism faces on top. The tile color is very intense in some of them and with color zoning in others, more intense in pinacoidal faces. From transparent to translucent, with good brilliance. Rutile inclusions can be observed as thin reddish needles inside the prism. They are very aerial disposed on a rhyolite matrix. Nice miniature. It is very interesting the origin of the word tepetate (tepetatl).