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Northwest Africa 4864
Basic information Name: Northwest Africa 4864
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4864
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 94 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  shergottite
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 192 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Dec 2008
Revised 23 Feb 2012: Erratum on O isotopes
Writeuphelp
Writeup from MB 94:

Northwest Africa 4864

Northwest Africa

Find: 2007

Achondrite (Martian, basaltic shergottite)

History: On July 16, 2007, a person brought 10 pieces totaling 94 g to the Institut für Planetologie (Münster) for classification.

Physical characteristics and petrography: (A. Bischoff, Mun) The rock is slightly weathered and relatively coarse-grained. The main constituents, pyroxene and maskelynite, have sizes up to 2 mm (Fig. 1). Near equal abundances of these phases are estimated. In some pyroxenes, glassy melt veins and pockets are visible. Minor phases include ilmenite, Fe-sulfide, and phosphate.

Mineral compositions and geochemistry: The mean composition of pyroxene is Fs50 ± 5; Wo13 ± 2. Maskelynite An51 ± 3. Oxygen isotopes (A. Pack and A. Suessenberger, University of Göttingen) revealed: 1st analysis: δ18O = + 5.3 ± .25‰, δ17O = +3.5 ± 0.15‰, Δ17O = +0.31 ± 0.03‰, 2nd analysis: δ18O = +5.1 ± 0.25‰, δ17O = +3.4 ± 0.15‰, Δ17O = +0.33 ± 0.03‰.

Classification: Achondrite (Martian, basaltic shergottite)

Type specimens: 19 g and one polished thin section is on deposit at Mun. An anonymous collector holds the main mass.


Writeup from MB 100:

Northwest Africa 4864, Correction


The values for δ17O shown in Meteoritical Bulletin 94 were reported incorrectly. The correct oxygen isotopic composition is: δ18O = + 5.3 ± .25‰, δ17O = +3.1 ± 0.15‰, Δ17O = +0.31 ± 0.03‰, 2nd analysis: δ18O = +5.1 ± 0.25‰, δ17O = +3.0 ± 0.15‰, Δ17O = +0.33 ± 0.03‰.

Data from:
  MB94
  Table 2
  Line 75:
State/Prov/County:Erfoud, Morocco
Date:2007
Mass (g):94
Pieces:10
Class:shergottite
Ferrosilite (mol%):50
Wollastonite (mol%):13
Classifier:A. Bischoff, Mun
Type spec mass (g):19
Type spec location:Mun,
Main mass:anonymous
Plots: O isotopes:  
Institutions
   and collections
Mun: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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