roselite


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roselite

[′rōz·ə‚līt]
(mineralogy)
(Ca,Co)2(Co,Mg)(AsO4)2·2H2O A pink or rose-colored, monoclinic mineral consisting of a hydrated arsenate of calcium, cobalt, and magnesium.
References in periodicals archive ?
The mineralogical fame of the Bou Azzer district is founded on its extensive suite of rare and colorful arsenates, and especially on its superlative macro-specimens of erythrite, roselite, roselitebeta and wendwilsonite.
At Mechoui, Ightem, and in Vein 2, Bou Azzer, arsenopyrite occurs as thin columnar crystals, associated at Bou Azzer with cobaltlotharmeyerite and roselite.
Associations include roselite, cobalt-rich talmessite and calcite.
The association with roselite, roselite-beta and sphaerocobaltite, however, pointed to a Co-Fe arsenate, and in 1992 an analysis carried out by H.
The calcium-copper end-member conichalcite, recently identified at the locality, was found in Vein 2, Bou Azzer, as warty crusts, bright spherules, and tiny (<0.1 mm) yellow-green, transparent crystals, with roselite and roselite-beta.
A pale-colored dolomite vein contains cobaltaustinite as flattened yellow-green crystals, some with blunt terminations, as well as compact, deep green spherules associated with roselite. These spherules have a high copper content, especially in their cores.
Vein 2, Bou Azzer, yields zinc-rich cobaltaustinite as tiny dark green spherules associated with roselite and hematite.
In Vein 2, Bou Azzer, goethite occurs commonly in dolomite cavities as 2-mm to 3-mm, lathe-shaped, black to shimmering golden brown crystals with pointed terminations; typical associated species include quartz, dolomite and hematite, and rarely also roselite. Excellent dark brown to red-brown, lathe-shaped goethite crystals to 2 cm have been collected in Ightem, where they are associated with lollingite.
In Vein 2, Bou Azzer, scaly hematite blankets walls of cavities in dolomite, with roselite, roselite-beta and transparent calcite.
The spheres rest, with roselite and calcite, in cavities in a gray dolomite containing granular chalcopyrite and skutterudite.
Roselite [Ca.sub.2]([Co.sup.2+],Mg)(As[O.sub.4])[.sub.2] x 2[H.sub.2]O
The Bou Azzer district is by far the world's richest and finest locality for the members of the roselite group, which are otherwise extremely rare.