header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 21 Jul 2024
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 16461
Basic information Name: Northwest Africa 16461
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16461
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 760 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 672 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 22 Jan 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16461 (NWA 16461)

(Northwest Africa)

Purchased: 2022

Classification: Ureilite

History: Purchased in 2022 by Chris Monk from Younes Chaoui.

Physical characteristics: Single weathered stone with minor fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample has a protogranular texture comprised primarily of mm-sized olivine grains (Av. ~1 mm), and minor pigeonite, displaying 120 degree triple junctions. Olivine displays thin reduction rims at grain edges, usually in contact with Fe-Ni metal (occurring as either veinlets or blebs). Other phases identified include interstitial graphite and troilite.

Geochemistry: Olivine cores (Fa21.9±0.4, range Fa20.8-22.4, Cr2O3=0.75±0.03 wt. %, CaO=0.36±0.02 wt. %, MnO=0.45±0.04 wt. %, FeO/MnO=44±4, n=26), Olivine rims (range Fa9.8-19.6, n=16), Pigeonite (Fs10.7±4.8Wo8.3±1.7, range Fs4.2-18.8Wo5.0-10.7, Al2O3=0.41±0.20 wt. %, Cr2O3=1.13±0.12 wt. %, MnO=0.51±0.05 wt. %, FeO/MnO=13±6, n=10).

Classification: Ureilite.

Specimens: 22.52 g type specimen at Cascadia, main mass with Chris Monk.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P 2022
Mass (g):760
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):21.9±0.4
Ferrosilite (mol%):10.7±4.8
Wollastonite (mol%):8.3±1.7
Classifier:D. Sheikh, Cascadia
Type spec mass (g):22.52
Type spec location:Cascadia
Main mass:Chris Monk
Comments:CML 1615, CM025; submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

Direct link to this page