|
Northwest Africa 14684 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 14684 This is an OFFICIAL meteorite name. Abbreviation: NWA 14684 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 3 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 15 approved meteorites classified as Mesosiderite-A3. [show all] Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 6 Aug 2022 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 14684 (NWA 14684) (Northwest Africa) Purchased: 2020 Classification: Mesosiderite (group A3) History: Purchased January, 2020, by Mark Lyon from a northwest African dealer Physical characteristics: A single stone without fusion crust, cut surface reveals ubiquitous ameboid shaped metal set against a dark coarse groundmass. Petrography: (A. Ross, UNM; D. Dickens, NMMS; C. Agee, UNM) Microprobe examination of a polished mount shows pyroxene is the dominant phase, with significant amounts of plagioclase also present. Some pyroxene grains display exsolution lamellae. Plagioclase is often poikilitically enclosed in pyroxene grains. Image analysis of a section of a polished mount shows the silicate portion is composed of ~65% pyroxene, ~30% plagioclase, with remaining ~5% a mix of minor phases; silica, ilmenite, merrillite, chromite, and troilite. No olivine was detected. Metal makes up approximately 39% of this meteorite and is primarily segregated into irregular ameboid domains of approximately 1 mm to 2 mm, with less frequent larger grains ubiquitously distributed throughout the silicate domains. Both kamacite and taenite are present. No significant brecciation observed. Geochemistry: (A. Ross, UNM) Low-Ca pyroxene Fs33.2±0.8Wo3.8±0.8, Fe/Mn=26±1, n=4; high-Ca pyroxene Fs29.9±1.3Wo10.8±7.1, Fe/Mn=25±1, n=2; plagioclase An88.7±3.0Ab10.7±2.7Or0.6±0.3, n=4; Classification: Mesosiderite-A3. Relatively high percentage of plagioclase and silica consistent with group A. Segregated metal, equilibrated silicates, lack of significant brecciation consistent with type 3. Specimens: 27.6 g including a probe mount on deposit at UNM, Mark Lyon holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
|
||||||||||||||||||||||||||||
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) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|