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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:help 70 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Dec 2013
Writeuphelp
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 ~ En44Fs44Wo12 to ~ En19Fs61Wo20 (n=84), and is not well equilibrated. There are rare augite grains En28Fs32-38Wo33-40. The FeO/MnO of pigeonite is 32.2, s.d. 2.5. Plagioclase is An95±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
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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