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Northwest Africa 15777
Basic information Name: Northwest Africa 15777
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15777
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 83 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  L7
Recommended:  L7    [explanation]

This is 1 of 33 approved meteorites classified as L7.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Apr 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15777 (NWA 15777)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (L7)

History: A single 83 g sample was found in northwest Africa and was purchased by Shun Chung Yang (S-R meteorites) in 2023.

Physical characteristics: Stone has an irregular shape and is mottled brownish orange with dispersed 0.5 cm-sized diopside crystals.

Petrography: Description and classification (A. Love, App) Sample shows: up to 5mm oikocrysts of orthopyroxene and (up to 3 mm) clinopyroxene that enclose smaller rounded chadacrysts of olivine, up to 3.5mm regions of plagioclase networks that enclose olivine and orthopyroxene and regions composed entirely of granoblastic textured olivine and orthopyroxene. Additional minerals are: weakly zoned plagioclase, up to 3mm-sized FeNi grains(~2 vol%), troilite, chromite and apatite.

Geochemistry: (A. Love, App) Olivine (Fa22.9±0.2, Fe/Mn=43.2±0.9, n=12); low Ca-pyroxene (Fs20.3±0.3Wo2.2±0.2, Fe/Mn=27.1±0.8 n=12); Ca-pyroxene (Fs8.4±0.4Wo41.5±1.5, Fe/Mn=19.8±1.6 n=8); plagioclase (Ab83.9±2.3Or4.7±1.1 n=20).

Classification: Ordinary chondrite (L7 U-S1 W1). Based on recrystallized textures, presence of plagioclase networks (Tait et al, 2014) and mineral compositions, sample is an L7.

Specimens: Shun-Chung Yang (S-R meteorites) holds the main mass. A polished thin section and a crusted individual weighing 20.3 g are on deposit at App.

Bibliography:
  • Tait A.W., Tomkins A.G., Gode B.M., Wilson S.A., Wilson, and Hasalova P. (2014) Investigation of the H7 ordinary chondrite, Watson 012: Implications for recognition and classification of Type 7 meteorites. Geochim. Cosmochim. Acta 134 175-196. (link)
Data from:
  MB112
  Table 0
  Line 0:
Date:P 2022
Mass (g):83
Pieces:1
Class:L7
Shock stage:U-S1
Weathering grade:W1
Fayalite (mol%):22.9±0.2
Ferrosilite (mol%):20.3±0.3; 8.4±0.4
Wollastonite (mol%):2.2±0.2; 41.5±1.5
Magnetic suscept.:5.00
Classifier:A. Love, App
Type spec mass (g):20.3
Type spec location:App
Main mass:Shun-Chung Yang (S-R meteorites)
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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