A secondary mineral occurring in the oxidized zones of arsenic- and zinc-bearing deposits. The structure of legrandite (and paradamite) is characterized by the occurrence of proton transfer tunnels along crystal axes.
Legrandite is a rare zinc arsenate mineral, Zn 2 (AsO 4)(OH)·(H 2 O).. It is an uncommon secondary mineral in the oxidized zone of arsenic bearing zinc deposits and occurs rarely in granite pegmatite.Associated minerals include: adamite, paradamite, köttigite, scorodite, smithsonite, leiteite, renierite, pharmacosiderite, aurichalcite, siderite, goethite and pyrite.
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Legrandite was first discovered in the Flor de Peña Mine, Nuevo León, Mexico. However, the best-known gem locality is the Ojuela Mine, Mapimí, Mexico. It produces magnificent crystal clusters, single crystals up to 6 cm long and 7.5 mm thick.
Legrandite is a rare and beautiful mineral that is a favorite of mineral collectors. It is known world wide from the famous localities around Mapimi, Mexico. Legrandite is a vitreous mineral that seems to radiate its unusually rich yellow color.
From a recent find at this famous locality, glassy partly gemmy brilliant bright yellow terminated crystals of legrandite to 2.5 cm in size set upon a 4.5 x 4.0 x 3.0 cm matrix. Complete all-around, this is an outstanding condition. It is been a long time since top examples of the species have been found at this locality, this miniature example is truly superb.
Media in category "Legrandite" The following 99 files are in this category, out of 99 total.
Legrandite definition is - a mineral Zn14(OH)(AsO4)912H2O consisting of a hydrous basic arsenate of zinc.
Tucked away in the second room, their case had what was at that time the finest known example of Mapimi, Mexico legrandite. The matrix specimen measured about 8 inches across and was an open maw of pale brown goethite with bright yellow legrandite crystals jutting into the opening like so many dragon teeth.