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Northwest Africa 10019
Basic information Name: Northwest Africa 10019
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10019
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 606 g
Meteoritical Bulletin:  MB 104  (2015)  Pallasite, ungrouped
Recommended:  Pallasite, ungrouped    [explanation]

This is 1 of 12 approved meteorites classified as Pallasite, ungrouped.   [show all]
Search for other: Metal-rich meteorites, Pallasites
Comments: Approved 9 Mar 2015
Writeup from MB 104:

Northwest Africa 10019 (NWA 10019)

(Northwest Africa)

Purchased: 2015

Classification: Pallasite (ungrouped)

History: Purchased by Steve Arnold from Morocco in January 2015.

Physical characteristics: One 580 g fusion-crusted individual and 26 g of several small fusion-crusted pieces. Saw cuts and thin slices show angular orange-brown-green, translucent olivines, the largest 28 mm long, with many smaller (0.5-5 mm) angular grains, some of which are darker colored pyroxenes, all set in metal; only minor oxidation.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately ~50% olivine, ~10% orthopyroxene, ~20% taenite, ~15% kamacite, minor calcic plagioclase, troilite, chromite, and calcium-magnesium phosphates.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa16.8±0.2, Fe/Mn=35±2, n=7; low Ca pyroxene Fs15.4±0.2Wo1.0±0.2, Fe/Mn=23±1, n=6; plagioclase An75.9Ab23.1Or1.0, n=1; kamacite Fe=93.1±2.0, Ni=6.6±0.2, Co=0.61±0.03 (all wt%), n=4; taenite Fe=72.0±4.0, Ni=27.4±2.4, Co=0.19±0.05 (all wt%), n=5; troilite Fe=59.9, Ni=0.2, Co=0.1, S=35.2 (all wt%), n=1. Likely farringtonite Mg3(PO4)2 and stanfieldite Ca3Mg3(PO4)4 detected in EDS, chromite also detected. Oxygen isotopes (K. Ziegler, UNM): acid-washed material analyzed in 11 replicates by laser fluorination gave, respectively δ18O= 3.286, 3.782, 3.878, 3.359, 3.548, 3.607, 3.935, 3.871, 3.817, 3.426, 3.516; δ17O= 1.479, 1.760, 1.760, 1.529, 1.635, 1.630, 1.846, 1.784, 1.763, 1.571, 1.599; Δ17O= -0.256, -0.237, -0.288, -0.245, -0.238, -0.274, -0.232, -0.260, -0.252, -0.238, -0.257 (linearized, all per mil).

Classification: Pallasite, ungrouped. This is a pyroxene pallasite with elevated Fa values similar to Fa in Springwater (PMG-an), ungrouped classification is based on oxygen isotope values similar to the PMG, but unlike any known pyroxene pallasite.

Specimens: 20.6 g including a probe mount on deposit at UNM, Steve Arnold holds the main mass

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):606
Class:Pallasite, ungrouped
Shock stage:low
Weathering grade:low
Fayalite (mol%):16.8±0.2
Ferrosilite (mol%):15.4±0.2
Wollastonite (mol%):1.0±0.2
Classifier:C. Agee, UNM
Type spec mass (g):20.6
Type spec location:UNM
Main mass:Steve Arnold
Comments:Field Name SA-3; submitted by C. Agee
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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