MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 11 Jul 2024
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 8777
Basic information Name: Northwest Africa 8777
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8777
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 49.1 g
Meteoritical Bulletin:  MB 104  (2015)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 156 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 27 May 2015
Writeup from MB 104:

Northwest Africa 8777 (NWA 8777)

(Northwest Africa)

Purchased: 2013 Oct

Classification: Ungrouped achondrite

History: Purchased by Stefan Ralew in October 2013 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Metamorphic texture with triple grain junctions. Aggregate of predominantly orthopyroxene (88.6 vol.%), olivine (9.0 vol.%) with accessory calcic plagioclase, Al-bearing chromite, Ni-poor kamacite and troilite.

Geochemistry: Orthopyroxene (Fs25.5-25.6Wo3.1-2.7, FeO/MnO = 29-34, N = 3), olivine (Fa30.7-31.1, FeO/MnO = 46-49, N = 3), plagioclase (An77.3-78.8Or1.1-0.5, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 1.078, 1.239, 1.257; δ18O 2.659, 2.912, 2.851; Δ17O -0.326, -0.299, -0.248 (all per mil).

Classification: Achondrite (ungrouped). Although in texture and oxygen isotopic composition this specimen resembles some brachinites, it is much too orthopyroxene-rich and its constituent plagioclase much too calcic to have an obvious affinity with brachinites.

Specimens: 9.9 g including one polished thin section at UWB; main mass with Ralew.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2013 Oct
Mass (g):49.1
Shock stage:low
Weathering grade:low
Fayalite (mol%):30.7-31.1
Ferrosilite (mol%):25.5-25.6
Wollastonite (mol%):3.1-2.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):9.9
Type spec location:UWB
Main mass:S. Ralew
Comments:R14-1; submitted by A. Irving
Plots: O isotopes:  
   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)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Direct link to this page