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Northwest Africa 15774 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15774 This is an OFFICIAL meteorite name. Abbreviation: NWA 15774 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 79 approved meteorites classified as CK3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites | ||||||||||||||||||||||||||||
Comments: | Approved 4 Mar 2023 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 112:
Northwest Africa 15774 (NWA 15774) (Northwest Africa) Purchased: 2022 Classification: Carbonaceous chondrite (CK3) History: Purchased by Adam Aaronson in 2022. Physical characteristics: Flight-shaped stone with regmaglypts, dark fusion crust on exterior with patches of caliche. Broken surface reveals numerous distinct chondrules set in a dark colored, fine-grained matrix. Scattered CAIs are visible throughout. Petrography: (C. Agee, UNM) This meteorite has primarily type-II porphyritic olivine chondrules and type-I porphyritic pyroxene chondrules. Most chondrules have glass or mesostasis. Ubiquitous chromium-bearing magnetite was observed, often decorating chondrules. No metals or sulfides were detected. Geochemistry: (A. Ross, UNM) Olivine Fa18.8±16.9, Fe/Mn=103±51, Cr2O3= 0.09±0.09 (wt%), n=10; diopside Fs5.2±5.3Wo40.7±9.0, n=4; enstatite Fs1.4±0.3Wo4.5±3.2, n=3; magnetite Cr2O3=2.5±0.1 wt%, n=2. Classification: Carbonaceous chondrite CK3. CK based on the presence of chromium-bearing magnetite and absence of metal and sulfide. Type 3 based on the standard deviation of Fa in olivine and the presence of mesostasis and glass in porphyritic chondrules Specimens: 22 g on deposit at UNM, Adam Aaronson holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB112 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) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Photos: |
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |