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Northwest Africa 13167 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13167 This is an OFFICIAL meteorite name. Abbreviation: NWA 13167 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 25 approved meteorites classified as C2-ung. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and Ungrouped chondrites | ||||||||||||||||||||||||||||||||
Comments: | Approved 1 Nov 2020 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 13167 (NWA 13167) (Northwest Africa) Purchased: 2019 Classification: Carbonaceous chondrite (C2, ungrouped) History: The meteorite was purchased from a meteorite dealer in Morocco. Physical characteristics: Five black individuals partly covered with fusion crust. Petrography: The meteorite a brecciated matrix-dominated carbonaceous chondrite with chondrules (mean diameter about 300 μm), mineral fragments, and few CAIs. Most of the components are surrounded by fine-grained dust rims. The matrix is highly porous and composed of Ca-carbonates, phyllosilicates with fibrous and flaky appearance, and Fe-sulfides. Some FeNi metal grains are present mostly as inclusions in forsteritic olivine. Geochemistry: Mean values of defocused matrix analyses (beam diameter 10 µm; all wt%; N=25): SiO2: 24.1, TiO2: 0.03, Na2O: 0.46, Cr2O3: 0.29, MgO: 13.9, MnO: 0.16, FeO: 31.2, Al2O3: 2.50, NiO: 2.10, P2O5: 0.34, S: 4.6, Total: 79.69; Oxygen isotopes (K. Ziegler, UNM): 6 acid-washed fragments analyzed by laser fluorination gave: δ18O=-6.769, -2.952, -1.991, 1.322, -2.345, -3.978; δ17O=-10.566, -7.481, -6.795, -4.079, -6.747, -8.036; Δ17O= -6.992, -5.922, -5.744, -4.777, -5.509, -5.936 (all per mil) Classification: C2 due to petrography and presence of phyllosilicates and carbonates. Ungrouped according to oxygen isotopic composition which is incompatible with CM. | ||||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||||
Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) 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. 109, in preparation (2020)
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Photos: |
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |