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

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

Amblygonite
'Apatite'
Beryl
Bismite
Bismuth
Bismuthinite
Bismutite
Emplectite
Fluornatromicrolite
Hodrušite
Ingodite
'Joséite-A'
'Joséite-B'
Microlite Group
Muscovite
Pyrite
Quartz
Spodumene
Tetradymite
Triphylite
Zircon


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.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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