|
Northwest Africa 12392 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 12392 This is an OFFICIAL meteorite name. Abbreviation: NWA 12392 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 502 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 318 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 9 Feb 2019 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12392 (NWA 12392) (Northwest Africa) Purchased: 2018 Classification: Martian meteorite (Shergottite) History: Purchased from Rachid Chaoui in Morocco, August 2018. Physical characteristics: Single stone, lacking fusion crust. Saw cut reveals a mix of brown pyroxene grains and black maskelynite domains and shock melt. Petrography: (C. Agee, UNM) Igneous rock with diabasic texture. The two major phases in this meteorite are pigeonite and maskelynite. The pigeonite has a modal abundance of approximately 75% and shows significant core to rim zoning in backscatter electron images. No augite was detected. Maskelynite has modal abundance of approximately 20%. Ubiquitous ilmenite and ulvöspinel are present. Shock melt veins with vesicles were observed throughout. Geochemistry: (C. Agee, UNM) Pigeonite Fs53.5±20.3Wo13.7±6.4, core to rim range Fs26.3Wo4.5 Ð Fs76.3Wo16.8, Fe/Mn=36±5, n=13; maskelynite An51.1±2.0Ab48.0±1.8Or0.9±0.6, n=7; Shock melt (20 μm defocused electron beam) SiO2=50.2±2.0, TiO2=0.81±12, Al2O3=10.2±3.7, Cr2O3=0.13±0.05, MgO=6.0±1.9, FeO=19.9±3.9, MnO=0.47±0.10, NiO=0.02±0.03, CaO=9.8±0.4, Na2O=1.6±0.7, K2O=0.10±0.03 (all wt%), n=7. Classification: Pigeonite basalt, augite absent. Specimens: 20.1 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB108 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 Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
| ||||||||||||||||||||||||||||
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.
|