Meteoritical Bulletin: Entry for Northwest Africa 2177

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Northwest Africa 2177

Basic information

Name: Northwest Africa 2177
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2177
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 74.8 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 571 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 28 Mar 2007

Writeup

help

Writeup from MB 91:

Northwest Africa 2177

Northwest Africa

Find: 2003

Achondrite (eucrite)

History: Several stones were found by an anonymous finder in the western part of the Sahara and purchased by M. Chinellato in Erfoud, Morocco, in 2003.

Physical characteristics: The total mass is 74.8 g. The largest mass, weighing 21 g, has no fusion crust and appears dark gray on its surface.

Petrography: (V. Moggi Cecchi and G. Pratesi, MSP) A polymict breccia consisting of basaltic and mineral clasts set into a fine-grained matrix of exsolved Ca pyroxene and plagioclase. The large clasts are predominantly plagioclase and exsolved low-Ca pyroxene. Minor phases include silica and Al chromite. Exsolution lamellae in pyroxene are generally very fine.

Mineral compositions and geochemistry: Plagioclase (An₈₉), orthopyroxene (Fs₅₃En₄₄Wo₂), pigeonite (Fs₃₇En₃₃ Wo₂₈), pigeonite lamellae (Fs₅₁En₃₇Wo₁₂). Oxygen isotopes: (I. Franchi and R. Greenwood, OU) δ¹⁷O = 1.89, δ¹⁸O = 4.06, Δ¹⁷O = −0.22 (all ‰).

Classification: Achondrite (eucrite); moderate shock, minimal weathering.

Type specimen: A total of 15.4 g and one thin section are on deposit at MSP. MChin holds the main mass.

Data from:
  MB91
  Table 2
  Line 69:

Date:	2003
Mass (g):	74.8
Pieces:	Many
Class:	Euc
Classifier:	V. Moggi Cecchi and G. Pratesi, MSP
Type spec mass (g):	15.4
Type spec location:	MSP
Main mass:	MChin

Plots:

O isotopes:

Institutions
and collections

MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
MChin: Matteo Chinellato, Via Triestina, 126/A-30030 Tessera, Venezia, Italy; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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