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Northwest Africa 13765 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13765 This is an OFFICIAL meteorite name. Abbreviation: NWA 13765 Observed fall: No Year found: 2014 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 258 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||||
Comments: |
Approved 13 Mar 2021 Revised 4 Apr 2021: Aligning classification with text | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13765 (NWA 13765) Boujdour, Morocco Find: 2014 Classification: HED achondrite (Eucrite) History: Purchased by Douglas Chenin from a Moroccan meteorite dealer in 2014. Reportedly found the same year at Jrifia near Boujdour, Morocco. Physical characteristics: This meteorite is a single stone covered in black shiny fusion crust. Numerous fine cracks are present on the surface, small chipped spots reveal light tan colored interior. A freshly cut window shows a fine-grained texture with white feldspar grains and light gray pyroxene grains. Petrography: (C. Agee, UNM) Electron microprobe analysis of a polished mount shows a mildly brecciated rock having clasts with variable grain size. The finest grained clasts have plagioclase and pyroxene in size range 50-200 μm. Coarser grained clasts show elongate plagioclase up to 500 μm and equant pyroxene 100-400 μm. Very fine exsolution lamellae are present in both low-Ca pyroxene and augite. Chromite, Fe-metal, silica, and ilmenite are ubiquitous accessory minerals. Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs61.5±2.2Wo3.0±1.2, Fe/Mn=31±2, n=10; augite Fs27.3±0.5Wo43.5±0.6, Fe/Mn=31±2, n=10; plagioclase An88.9±0.8Ab10.5±0.7Or0.6±0.3, n=6. Compositionally uniform throughout with some grain size variation from clast to clast. Pyroxenes show nearly complete chemical compositional separation between low-Ca pyroxene and augite. Classification: Monomict eucrite. Specimens: 16.5 g on deposit at UNM, D. Chenin holds the main mass. | ||||||||||||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
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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. 110, in preparation (2021)
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Photos: |
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Geography:![]() |
Statistics: This is the only approved meteorite from Boujdour, Morocco This is 1 of 1837 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater) |