| MetSoc Home Publications Contacts |
|
||
|
||
| Northwest Africa 12984 | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Northwest Africa 12984 This is an OFFICIAL meteorite name. Abbreviation: NWA 12984 Observed fall: No Year found: 2017 Country: Mauritania Mass:  850 g | ||||||||||||||||||||||
| Classification history: |
This is 1 of 140 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped. [show all] Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons | ||||||||||||||||||||||
| Comments: | Approved 29 Feb 2020 | ||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Northwest Africa 12984 (NWA 12984) Mauritania Find: 2017 Classification: Iron meteorite (ungrouped) History: Purchased online in 2017 by George Penneff from a seller in Mauritania. Physical characteristics: Single stone with dark-brown fusion crust. Petrography: (D. Sheikh, FSU) Coarse-grained octahedrite having a well-developed Widmanstätten pattern with 1.9-2. 8mm kamacite bands, taenite, and plessite. Troilite nodules present as well. Geochemistry: (INAA, ActLabs) Ni=70.2 mg/g (DL=0.01 mg/g), Co=4.54 mg/g (DL=0.01 mg/g), Cr=353 µg/g (DL=1 µg/g), Cu=95 µg/g (DL=1 µg/g), Ga=37 µg/g (DL=1 µg/g), Ge=100 µg/g (DL=10 µg/g), As=11.2 µg/g (DL=0.5 µg/g), Re=0.23 µg/g (DL=0.01 µg/g), Ir=2.46 µg/g (DL=0.001 µg/g), Au=1.08 µg/g (DL=0.01 µg/g). Precision at detection limit to be ±100%, at ten times detection limit ±10-20% and at 100 times detection limit ±5%. Classification: Iron, Ungrouped. Although Ni (70.2 mg/g) and Co (4.54 mg/g) as similar to IAB-MG, Au (1.08 ppm) is lower than that of IAB irons, and so this sample is ungrouped. Specimens: 28.4 g at UCLA; main mass with Penneff. | ||||||||||||||||||||||
| Data from: MB109 Table 0 Line 0: |
|
||||||||||||||||||||||
| Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010) |
||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||
| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
| ||||||||||||||||||||||
| Photos: |
| ||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 166 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||