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Northwest Africa 13550
Basic information Name: Northwest Africa 13550
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13550
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 264 g
Classification
  history:
Recommended:  Pallasite    [explanation]

This is 1 of 76 approved meteorites classified as Pallasite.   [show all]
Search for other: Metal-rich meteorites, Pallasites
Comments: Approved 22 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13550 (NWA 13550)

Northwest Africa

Purchased: 02/2018

Classification: Pallasite

History: Purchased by Giorgio Tomelleri at the Erfoud market in February 2018. Main mass purchased from Giorgio Tomelleri and held by MSN-FI.

Physical characteristics: A single piece of metallic appearance remarkably oxidized totaling 264 g, without fusion crust

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): The meteorite is composed of up to 1 cm sized subrounded and partly fragmented olivine grains surrounded by a matrix of brownish iron oxides also present along the olivine grain boundaries and cracks. Iron-nickel alloys are completely weathered to Fe-hydroxides. On a polished thin section partially altered troilite spots are visible.

Geochemistry: EMP (V.Moggi Cecchi, G.Pratesi, S.Caporali, UniFi): Olivine Fa6.3±0.2 (n=9). Oxidized metal (El.Wt.%): ~57 % Fe, ~3 % Ni. Troilite (El.Wt.%): S: 43.8; Fe:50.4; O: 3.0, Cr: 2.2;

Classification: Pallasite (PMG)

Specimens: The main mass, 1 thick section and 1 thn section are on deposit at MSN-Fi

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 02/2018
Mass (g):264
Pieces:1
Class:Pallasite
Fayalite (mol%):6.28±0.6 (N=15)
Classifier:V. Moggi Cecchi, UniFi
Type spec mass (g):20.5
Type spec location:MSN-FI
Main mass:MSN-Fi
Finder:Anonymous
Comments:Submitted by Vanni Moggi Cecchi
Institutions
   and collections		 MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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