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El Quemado Pegmatite, El Quemado District, Nevados de Palermo, Salta, Argentina

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Name(s) in local language(s): Pegmatita El Quemado, Distrito de El Quemado, Nevados de Palermo, Salta, Argentina
 
This pegmatite main minerals are quartz, plagioclase, microcline, to which is added Spodumene, Muscovite, Biotite, Beryl, Lepidolite, Tourmaline, Sphalerite, Molybdenite, Uraninite, Niobite, Tantalite, Native Bismuth, Bismuthinite, Ferrotapiolite, Manganotantalite, Microlite, Uranomicrolite, Bismuthmicrolite, Hafniferous Zircon, Triplite, Montebrasite and other phosphates and uranium oxide minerals.
Minerals of the columbite group have varying compositions: from Ferrocolumbite to Manganocolumbite and the less evolved pegmatites and Shales to Manganotantalite in "El Quemado". In this case, Microlite, Uranomicrolite, and occasionally Bismuth-Microlite often accompany the most advanced members. Ferrocolumbite was determined by chemistry and x-ray diffraction.
The crystals are centimetric to millimetric, tabular, sub to euhedrales, with development of forms {010}, {100}, {110}, {130}, {011}, {111} in different combinations. Found in the intermediate areas, including in plagioclase, microcline or primary phosphates. Alluvial crystals are prismatic or tabular thicknesses and often have vertical striations. They are black, fragile and have metallic sheen to submetallic.

Mineral List



21 entries listed. 18 valid minerals.

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References

Márquez-Zavalía, M. F., Galliski, M. Á., Černý, P., & Chapman, R. (2012). An Assemblage Of Bismuth-Rich, Tellurium-Bearing Minerals In The El Quemado Granitic Pegmatite, Nevados De Palermo, Salta, Argentina. The Canadian Mineralogist, 50(6), 1489-1498.

Mineral and/or Locality  
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