cumengite

cumengite

[kyü′men‚jīt]
(mineralogy)
Pb4Cu4Cl8(OH)8·H2O A deep-blue or light-indigo-blue tetragonal mineral consisting of a basic lead-copper chloride occurring in crystals.
References in periodicals archive ?
There are also, of course, much fancier items in the collection, including sharp floater crystals and twins of some truly rare species: senarmontite, glaucodot, stolzite, hambergite, neptunite, epididymite, a petite cumengite "mace" on boleite, and (naturally) a superb specimen of a member of the whiteite group, specifically of whiteite-(CaFeMg).
In 1973 Swoboda returned to Mexico and spent three years mining for boleite and cumengite at the Amelia mine, Boleo, Baja California.
Pierre Bariand, curator at the Sorbonne in Paris, brought the world's largest cumengite crystals, found at Boleo in Baja California, Mexico.
For a single crystal, the largest cumengite in the world, exhibited once again by the Sorbonne, attracted a lot of attention.
The second presentation of the Miguel Romero Memorial Award went to Pierre Bariand, who again brought some of those super-rare cumengite crystals from Boleo, Mexico.
It is a star-shaped compound octahedron: try to imagine a hematite pseudomorph after a giant cumengite crystal and you will get the picture.
The 11 cumengites pictured on one page are individually as small as 0.
Once again Pierre Bariand brought those incredible Boleo cumengites to display.