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Northwest Africa 033
Basic information Name: Northwest Africa 033
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 033
Observed fall: No
Year found: 1999
Country: Algeria
Mass:help 192 g
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  C3
Meteoritical Bulletin:  MB 85  (2001)  C3
MetBase:  v. 7.1  (2006)  C3-ung
Recommended:  CL4    [explanation]

This is 1 of 3 approved meteorites classified as CL4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CL chondrites, and CL chondrites (equilibrated)
Comments: Revised 29 Aug 2021: Reclassification
Writeuphelp
Writeup from MB 110:

Northwest Africa 033 (NWA 033)

Bechar, Algeria

Find: 1999

Classification: Carbonaceous chondrite (CL4)

Revised classification and description.

Physical characteristics: : Carbonaceous chondrite with high chondrule abundance (72 vol%) and low amount of fine-grained matrix (21 vol%). Composed of irregularly formed Type-I chondrules, few Type-II chondrules, refractory inclusions (CAIs, AOAs), inter-chondrule metal and sulfide grains and matrix. Contains high amounts of (partly terrestrially oxidized) metal (magnetic susceptibility log χ (× 10-9 m3/kg) = 4.69). Mean chondrule size: 455±349 µm (65-2070 µm; n=274). Fragments of chondrules and refractory inclusions occur, but macroscopically this sample is unbrecciated. It is of shock stage C-S2 and has a weathering grade of W2.

Petrography: Olivine is equilibrated with a mean value of Fa13.5±0.6. The mean composition of low-Ca pyroxene is Fs7.9±3.1Wo0.9±0.2. Bulk oxygen isotopic composition: δ17O = -3.911±0.164; δ18O = 0.102±0.228; Δ17O = -3.964±0.046 per mil. Bulk Ti and Cr isotopic composition: ε50Ti ± 2σ = 2.35±0.05; ε54Cr ± 2σ = 0.64±0.12.

Geochemistry: Due to its characteristically low amount of matrix, highly depleted concentrations of volatile elements, high magnetic susceptibility, low Fa values of equilibrated olivine, and unique position in the ε50Ti-ε54Cr diagram, this sample was reclassified as a CL4 chondrite by Metzler et al. (2021).

Bibliography:
  • Metzler K., Hezel D.C., Barosch J., Wölfer E., Schneider J.M., Hellmann J.L., Berndt J., Stracke A., Gattacceca J., Greenwood R.C., Franchi I.A., Burkhardt C., and Kleine T. (2021) The Loongana (CL) group of carbonaceous chondrites. Geochim. Cosmochim. Acta 304, 1–31. (link)
Data from:
  MB85
  Table 4
  Line 1:
Origin or pseudonym:Taouz 003
Date:1999
Latitude:30°54'N
Longitude:3°58'W
Mass (g):192
Pieces:1
Class:C3
Shock stage:S2
Weathering grade:W3/4
Fayalite (mol%):13.5±1.3
Ferrosilite (mol%):9.9±2.5
Classifier:A. Bischoff and T. Grund (Mün)
Type spec mass (g):22
Main mass:JNMC
Comments:NWA 033 is unusual in that it contains almost equilibrated chondrule olivines and low matrix abundance; δ18O = +1.42 ‰, δ17O = -2.69 ‰ (R. Clayton and T. Mayeda, UChi).
Plots: O isotopes:  
Institutions
   and collections
UChi: University of Chicago, Chicago, IL 60637, United States (institutional address; updated 28 Feb 2011)
Grund: H. Grundmann, Berlin, Germany (private address)
JNMC: jnmczurich, P.O. Box 208, CH-8155 Niederhasli, Switzerland; Website (private address; updated 4 Feb 2014)
Mün: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Hanno Strufe   
Geography:

Algeria
Coordinates:
     Catalogue of Meteorites:   (30° 54'N, 3° 58'W)
     Recommended::   (30° 54'N, 3° 58'W)

Statistics:
     This is 1 of 22 approved meteorites from Bechar, Algeria
     This is 1 of 1140 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)
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Synonymshelp: Taouz 003 (From MetBase)

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