La eosforita de las pegmatitas del distrito El Quemado, Nevados de Palermo, Provincia de Salta.

MÁRQUEZ ZAVALÍA, M. F., Y GALLISKI, M. A.,

San Luis

Congreso; VIII Congreso Geológico Argentino; 1981

Asociación Geologica Argentina

Eosphorite was found in three pegmatites of El Quemado District located in Nevados dePalermo Range, Dptos. La Poma and Cachi. Salta Provine, Argentine. The pegrnatites si e zoneddykes with rich plagioclase units and Nb-Ta, Be. Li, U mineralization. The minerals occu rs indruses of little vugs in the incide of the intermediate zone associated with quartz, albite, muscovite,anatite, niobite and torbemite. The best specimens came from El Peñón pegmatite in rosecrystals of about 1.5 cm long with the forms: a {100); b {0101; m11101; s {121}.Optical propenies are: a = 1.638; fi = 1,662; y = 1,667; 23, = 45° (-); Dispersion r < y strong;X = b; Y = a; Z ? c. G = 3,095. Chemical analysis gavie: RO, = 30,24; Al 203 = 24,19; Mn0 = 25.30;Fe0 = 5,67; H 20 = 14,60, is also mailable X ray data. Others phosphates that occur in the samebody are: triphylite-lithiophylite, arrojadite, brazilianite, laueit, alluaudit. etc.