arrojadite

arrojadite

[‚ar·ə′jä‚dīt]
(mineralogy)
Na2(Fe,Mn)5(PO4)4 Dark-green mineral crystallizing in the monoclinic system, being isostructural with dickinsonite and occurring in masses.
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References in periodicals archive ?
(1980) found that tripilite [Fe.sub.2](P[O.sub.4])F] (and probably other primary iron phosphates minerals such as triphylate, triplodite, and arrojadite) behaved similarly to primary apatite and could be dissolved by HCl.
At the Main Show, the Tyson's Minerals stand showed off sparkling, mostly thumbnail and miniature specimens of, among others, lustrous shaving-brush aggregates of acicular, deep blue gormanite crystals on beds of sharp, gemmy brown, rhombohedral siderite crystals; very lustrous, high-quality, sharp, blue-black lazulite crystals to 1.5 cm on siderite druses with quartz; white hexagonal-tabular crystals of whitlockite to 2 cm; lustrous pseudo-octahedral wardite crystals to 1.5 cm, in varying hues of colorless, green, yellow and brown: translucent white apatite prisms to 5 mm in little groups; and the rare arrojadite as lustrous brown, platy crystals to 3 mm densely covering matrix.
No micromounts, these new ones, but rather lustrous gray-white to palest green, translucent tabular crystals from 5 mm to 2 cm, growing individually and as tight clusters on dark blue matrix of massive rare phosphates (gormanite, kulanite, arrojadite, etc.).
More recently the list has been expanded to include jahnsite (Moore and Ito, 1978a), arrojadite (Moore and Ito, 1979), dufrenite and one unidentified zinc phosphate (Hirson, 1965) having lower refractive indices than the zincian rockbridgeite of Lindberg and Frondel, 1950), a kidwellite-like mineral (Moore and Ito, 1978b) and johnsomervilleite (Araki and Moore, 1981).
Arrojadite occurs at Sapucaia as small, bottle-green to yellowish green patches in vivianite-stained triphylite that was common in the beryl-rich zone (worked 1975-1977).
The suffix nomenclature (single and multiple) has subsequently been used in revised nomenclature schemes for several mineral groups: zeolites (Coombs et al., 1997), labuntsovites (Chukanov et al., 2002), arrojadites (Chopin et al., 2006) and epidotes (Armbruster et al, 2006).