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Northwest Africa 10019 | |||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
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![]() |
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: MB104 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions 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) |
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Catalogs: |
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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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Geography: |
Statistics: This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names) |