creedite


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creedite

[′krē‚dīt]
(mineralogy)
Ca3 Al2(SO4)(F,OH)10·2H2O A white or colorless monoclinic mineral consisting of hydrous calcium aluminum fluoride with calcium sulfate, occurring in grains and radiating crystalline masses; hardness is 2 on Mohs scale, and specific gravity is 2.7.
References in periodicals archive ?
There was also malachite in dark green, ropy flows and hemispheres coating cabinet-size pieces of matrix; fine examples of the now familiar Ojuela wulfenite and aurichalcite-included calcite; Milpillas mine azurite; 10-cm subparallel crests of white barite crystals on drusy amethyst (the first good barite from the amethyst fields of Las Vigas, Veracruz); spectacular Navidad mine, Durango creedite and Cerro de Mercado, Durango fluorapatite specimens .
Not by any means "new," but entirely distinctive and always dramatic, are the great spherical groups of transparent, colorless (but invariably brown-orange stained) creedite crystals from the Navidad mine, Durango, Mexico.
Specimens showing gleaming sprays of colorless to amethystine creedite crystals from the Potosi mine, West Camp, Santa Eulalia district, Chihuahua were first found in quantity around 1970, and the early 1980s saw several major finds, but the bounty ended in the mid-1980s.
At Prospector's Choice Minerals (call Ron Anderson in Littleton, CO at 303-790-9280), one could find lightly attached spheres of transparent, colorless crystals of creedite from the Navidad mine, Durango, Mexico, in specimens measuring to 12 cm in diameter, for $50.
com) also maintained a presence at Marty Zinn's hotel show, and in this room one could see specimens from a new discovery of creedite made earlier this year in the Henderson mine, Clear Creek County, Colorado.
In a few of the specimens, carbonate-cyanotrichite is associated with cubic crystals of fluorite, which occurs in various colors at Qinglong; well-developed crystals of the uncommon species creedite were discovered as well.
Creedite has been reported from Llallagua by Petrov et al.
At least 120 mineral species have been reported, including fine specimens of calaverite, sylvanite, krennerite, melonite and creedite.
Minerama (49 rue Republique, 42800 Rive-de-Gier, France), occupying the large booth to the right as you are facing the theater, had come up with some fine colored creedite from Mina Navidad, Abasolo, Durango, Mexico.
However, about a year ago, in the old open pit, about 50 good specimens of pale purple creedite were found--the first recorded occurrence of this species at Cripple Creek--and Dave Bunk had a half-casefull for sale at the Holiday Inn in Denver.
Excellent neptunite from California, choice anhydrite from Mexico as well as pink smithsonite, superb Los Lamentos wulfenites, rare Mexican creedite and even rarer paradamite were available for a price.
The superb, colorless to violet creedite crystal groups were exciting and sold quickly.