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Asunto:[gr_mulhacen] Barahonaite-(Al) and barahonaite-(Fe),
Fecha: 10 de Mayo, 2008  23:12:48 (+0200)
Autor:PhilWeb <psaget @.......fr>

Hola todos
Una nueva informacion en bibliografia sobre Dolores Prospect.

Despues de 2 dias lluviosas llegamos a casa despues la visita de:
- Dolores + Ramonete
- Maria Josefa + Sol + Niñas
- El Centenillo
- Pinar de Bédar
En algunas semanas, podre dar a todos un resumen de nuestras muestras microminerales.
Gracias a todos para su ayuda.
Friendly from Bretaña
Philweb

Vinals, J; Jambor, JL; Raudsepp, M; Roberts, AC; Grice, JD; Kokinos, M; Wise, WS
Barahonaite-(Al) and barahonaite-(Fe), new Ca-Cu arsenate mineral species, from murcia province, southeastern Spain, and Gold Hill, Utah
CANADIAN MINERALOGIST, 46: 205-217, Part 1; FEB 2008

Abstract:
The new mineral species barahonaite-(Fe) and barahonaite-(Al), simplified as (Ca,Cu,Na,Fe3+,Al)(12)Fe-2(3+)(AsO4)(8)(OH)(x)center dot nH2O and (Ca,Cu,Na,Al)(12)Al-2(AsO4)(8)(OH)(x)center dot nH(2)O, respectively, occur at the Dolores prospect in Murcia Province, southeastern Spain. Barahonaite-(Al) also occurs at the former Gold Hill mine in Tooele County, Utah. The minerals form beads, coalesced beads, and crusts of submillimetric thickness whose Surfaces commonly glisten because of the presence of plates, up to 50 mu m in diameter (Utah), and razor-thin, tabular, composite crystals, up to 20 VLm long (Spain). Barahonaite-(Al) is pale blue, brittle, transparent to translucent, soft, nonfluorescent, and has a white streak and D-meas 3.03 g/cm(3); barahonaite-(Fe) is similar, but is yellow with a greenish tint and has a white to pale yellow streak. Both minerals are readily soluble in 10% HCl. Barahonaite-(Fe) is biaxial negative, alpha 1.664(2), beta approximate to gamma, ga!
mma 1.677(2), 2V(means) 45-80 degrees; the indices of refraction of barahonaite-(Al) are alpha 1.616(2), gamma 1.622(2). The compositions for barahonaite-(Fe) and barahonaite-(Al) from Spain, as determined with an electron microprobe, are, respectively, Na2O 2.07, 1.65, MgO 0.14, 0.00, CaO 12.96, 15.71, CuO 12.41, 14.59, Al2O3 1.71, 9.52, Fe2O3 13.78, 0.10, SiO2 0.33, 0.14, P2O5 0.42, 0.35, AS(2)O(5) 41.18, 42.16, SO3 0.29, 1.24, Cl 0.91, 0.06, H2O (by difference) 14.01, 14.49, which correspond to (Ca4.95Cu3.34Na1.43Mg0.07 Fe1.703+Al0.72)Sigma(12.21) Fe-2.00(3+)[(AS(0.96)S(0.01)P(0.01)Si(0.01))O-4](8)[(OH)(6.82)Cl-0.55]Sigma 7.37 center dot 13.2H(2)O and to (Ca5.75Cu3.77Na1.09Al1.84Fe0.033+)Sigma Al-12.48(2.00) [(As0.94S0.04P0.01Si0.01)O-4](8)[(OH)(7.95)Cl-0.04]Sigma(7.99)center dot 12.5H(2)O for XO4 = 8. Indexing of the powder-diffraction patterns gave a 10.161(7), h 22.39(2), c 10.545(10) angstrom, beta 93.3(1)degrees for barahonaite-(Fe), and a 9.964(3), b 22.43(1), c 10.555(6) angstrom. beta 92.76(6)degrees for barahonaite-(Al). The stron
gest lines in the powder pattern [d in angstrom(I)(hkl)] are 22.0(100) (010), 11.2(70)(020), 5.068(20)(200), 3.345(20)(023, 310), 2.763(30)(053), 2.659(20)(172), and 2.541(20)(400) for barahonaite(Fe), and 22.0(100)(010), 11.16(70)(020), 4.983(50)(200), and 3.333(45)(250,113) for barahonaite-(Al). The compositions and X-ray data suggest a possible overall relationship to the smolianinovite group, and a close relationship between attikaite and barahonaite-(Al). The new name barahonaite-(Fe) honors Antonio Barahona (b. 1937) of Madrid, Spain, who collected the original specimens, and barahonaite-(Al) is the Al-dominant analog of barahonaite-(Fe).


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