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Northwest Africa 7135
Basic information Name: Northwest Africa 7135
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7135
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 51.3 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Chondrite-ung
Recommended:  Chondrite-ung    [explanation]

This is 1 of 25 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 22 Jan 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 7135 (NWA 7135)

Northwest Africa

Purchased: 2010 Oct

Classification: Ungrouped chondrite

History: Purchased by Fabien Kuntz in October 2010 from a Moroccan dealer at the Munich Show.

Physical characteristics: Brown stone (51.3 g) lacking fusion crust and with evident light-colored, round chondrules.

Petrography: (A. Irving and S. Kuehner, UWS) Composed of separated, mostly spherical, relatively small chondrules (mean 0.69±0.53 mm, n=40) in a matrix (~30 vol.%) rich in altered kamacite. Some chondrules contain interstitial feldspathic glass. Minerals are olivine, zoned orthopyroxene, pigeonite, diopside, subcalcic augite, Cr-rich chromite, pyrrhotite, pentlandite, daubreelite, oldhamite, schreibersite and rare barite. The presence of highly reduced sulfides and phosphides suggest an atypical ordinary chondrite.

Geochemistry: Olivine, predominantly Fa4.8-6.3 (N = 15), with some more ferroan grains Fa19.8-19.9 (N = 2); orthopyroxene, Fs7.0-21.8Wo0.4-1.5 (N = 3); pigeonite, Fs17.3Wo6.9; subcalcic augite, Fs13.3-22.2Wo25.4-29.9 (N = 2). The mean olivine composition (Fa6) is much more magnesian than for H chondrites of similar subtype. Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O = 3.207, 3.649, 3.262, 3.379, 3.859; δ18O = 5.175, 6.072, 5.326, 5.333, 6.450; Δ17O = 0.475, 0.443, 0.450, 0.563, 0.453 (all per mil). Oxygen isotopes plot in a region above the TFL and at relatively high δ18O values.

Classification: Ungrouped chondrite, high metamorphic type 3 or type 4.

Specimens: 10.44 g including one polished thin section at PSF; main mass with Kuntz.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2010 Oct
Mass (g):51.3
Pieces:1
Class:Chondrite-ung
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):4.8-6.3
Ferrosilite (mol%):7.0-21.8
Wollastonite (mol%):0.4-1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):10.44
Type spec location:PSF
Main mass:F. Kuntz
Comments:K164; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Franco Vignato   
Wang Ziyao   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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