20997-184 - NWA Iron Meteorite. In study. 210g
20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g 20997-184 - NWA Iron Meteorite. In study. 210g

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20997-184 - NWA Iron Meteorite. In study. 210g

Piece under study.
Currently not for sale.

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Species
Iron Meteorite - In study
Age
-
Location
Found in South Morocco - Northwest Africa
Formation
Iron meteorite
Size
55.5 mm   •    in
Weight
210 g   •    oz
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Description

Petrographic description


Under polarized-light microscope, any minerals were identified. The sample is totally composed of opaque minerals (ore minerals, metals). The scanning electron microscopy reveals that the chemical composition of the sample is mostly homogenous native iron (Fig. 2). Some areas are more altered, with formation of iron oxide minerals (hematite/magnetite). Silicate minerals are
also observed as plagioclase and Fe-mellilite (Figs. 2 and 3).

The presence of Fe-mellilite is observed in the EDS analysis. In the following table the mineral formulae was calculate to 7 oxygens using semi-quantitative results from EDS analysis.


Element wt % apfu, 7 O
Si 12.03 1.43
Al 4.62 0.62
Fe 18.01 1.08
Ca 24.56 2.05
Zn 1.44 0.07


According to the abundance of Fe native and the composition of the minerals, the analysed sample can be classified as an iron meteorite (Norton, 2002).

Mineralogy and textural properties of samples were studied on (30m-thick) polished thin sections using transmitted and reflected light microscopy at LPA (UA) and UGR.


Photomicrographs were performed by using:
o Petrographic microscope: ZEISS Assioskop (LPA-UA).
o Digital camera: Photometrics CoolSNAPcf
o Image capture Software: RS ImageTM v.1.8.6


Samples (polished thin-sections) also were studied under scanning electron microscope (Research Technical Services – UA). Minerals were located and identified using BSE mode on Hitachi S3000N SEM coupled with an X-ray detector Bruker XFlash 3001 for microanalysis (EDS) and mapping.


Semi-quantitative EDS X-ray microanalysis was performed using EDS spot analysis with acquisition time 60s and maximum process time to achieve best resolution of peaks in spectra.


ANNEX II. REFERENCES
Norton, O.R., 2002. The Cambridge Encyclopedia of Meteorites. Cambridge University Press, 374p.

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