Meteoritical Bulletin: Entry for Northwest Africa 8158

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Northwest Africa 8158

Basic information

Name: Northwest Africa 8158
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8158
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 70 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 11 Dec 2013

Writeup

help

Writeup from MB 102:

Northwest Africa 8158 (NWA 8158)

(Northwest Africa)

Purchased: May 2011

Classification: HED achondrite (Eucrite)

Physical characteristics: One stone covered with fresh fusion crust.

Petrography: (R.H. Hewins, MNHNP) Contains pigeonite, and minor augite, each with fine exsolution lamellae of the other (in the larger grains). Texturally heterogeneous (ophitic-granoblastic), and in grain size, perhaps a recrystallized breccia. Contains anorthite, rare tridymite needles, and three Fe oxide minerals, chromite, ulvöspinel and ilmenite.

Geochemistry: (R.H. Hewins, MNHNP) Pyroxene is pigeonite from ~ En₄₄Fs₄₄Wo₁₂to ~ En₁₉Fs₆₁Wo₂₀(n=84), and is not well equilibrated. There are rare augite grains En₂₈Fs_32-38Wo_33-40.The FeO/MnO of pigeonite is 32.2, s.d. 2.5. Plagioclase is An_95±0.3, n=18. Oxides are Sp₁₆Cr₆₁Usp₂₁Mgt₂, Sp₄Cr₁Usp₉₁Mgt₄ and Ilm₁₀₀Hem₀. Oxygen isotopes (N. Assayag and P. Cartigny, IPGP): two determinations gave delta δ¹⁸O = 3.022±0.063; Δ¹⁷O = -0.236±0.044 (per mil).

Classification: (R.H. Hewins, MNHNP, N. Assayag and P. Cartigny IPGP) Achondrite (eucrite). Typical eucrite textures, mineral compositions, and oxygen isotopic compositions.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P May 2011
Mass (g):	70
Pieces:	1
Class:	Eucrite
Ferrosilite (mol%):	42-67 and 12-22
Wollastonite (mol%):	12-22 and 33-40
Classifier:	R. Hewins, MNHNP; N. Assayag and P. Cartigny, IPGP
Type spec mass (g):	14
Type spec location:	MNHNP
Main mass:	Luc Labenne
Comments:	Submitted by R. Hewins

Plots:

O isotopes:

Institutions
and collections

MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 16 Feb 2024)
IPGP: Institute de Physique du Globe de Paris, 1 rue Jussieu, 75252 Paris, Cedex 05, France (institutional address; updated 3 Nov 2014)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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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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