Meteoritical Bulletin: Entry for Northwest Africa 11677

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Northwest Africa 11677

Basic information

Name: Northwest Africa 11677
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11677
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 499 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 27 Mar 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11677 (NWA 11677)

(Northwest Africa)

Purchased: 2017 Nov

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Darryl Pitt in November 2017 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Polymict breccia consisting predominantly of eucrite clasts (exhibiting intersertal, subophitic, diabasic and gabbroic textures) and related crystalline debris, together with ~10 vol.% of diogenitic orthopyroxene (exhibiting more ferroan reaction rims against the matrix). Other minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, Ti-chromite and troilite.

Geochemistry: Diogenitic orthopyroxene (cores Fs_31.3-33.5Wo_3.6-5.3, FeO/MnO = 35-36; rim Fs_53.8Wo_3.8, FeO/MnO = 32; N = 3), orthopyroxene host (Fs_61.2Wo_1.5, FeO/MnO = 36), clinopyroxene exsolution lamella (Fs_26.0Wo_42.9, FeO/MnO = 34), low-Ca pyroxene host (Fs_45.1Wo_7.1, FeO/MnO = 31), augite exsolution lamella (Fs_22.6Wo_39.1, FeO/MnO = 30), augite (Fs_30.1Wo_37.4, FeO/MnO = 35), plagioclase (An_88.7-89.1Or_0.3-0.6, N = 2).

Classification: Eucrite (polymict breccia).

Specimens: 21.1 g including one polished thin section at UWB; main mass with DPitt.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2017 Nov
Mass (g):	499.2
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	61.2; 26.0
Wollastonite (mol%):	1.5; 42.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	21.1
Type spec location:	UWB
Main mass:	D. Pitt
Comments:	Work name MVCH 324; submitted by A. Irving

Institutions
and collections

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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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