header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 14 Oct 2020
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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:help 850 g
Classification
  history:
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 130 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
Writeuphelp
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:
Date:2017
Mass (g):850
Pieces:1
Class:Iron, ungrouped
Shock stage:low
Weathering grade:low
Classifier:D. Sheikh, FSU
Type spec mass (g):25.5
Type spec location:UCLA
Main mass:Penneff
Comments:Submitted by Daniel Sheikh
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)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

Direct link to this page