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Northwest Africa 13088
Basic information Name: Northwest Africa 13088
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13088
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 1867 g
Classification
  history:
Recommended:  L3.1    [explanation]

This is 1 of 17 approved meteorites classified as L3.1.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 31 Jan 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13088 (NWA 13088)

Morocco

Purchased: 2017

Classification: Ordinary chondrite (L3.1)

History: Purchased in Morocco by Brahim Tahiri in late 2017 and brought to Sean Tutorow in late December 2017. Tutorow donated 94.40 g to Cascadia for classification.

Physical characteristics: Cascadia received two thin slices completely covered in a coating which darkens the sample and causes it to appear wet. Overall, the slices are dark orange-brown in color and show abundant chondrules. Some areas have chondrules set in an orange-brown background, while in other areas the background is dark brown to black. Boundaries between the two are generally indistinct, although there is one example of a sharp contact between a large (4 × 3 cm, truncated along the edge of the slice), angular, orange-brown colored clast and the rest of the slice, indicating that this sample is brecciated.

Petrography: (M. Hutson and A. Ruzicka, Cascadia): The section is crossed by numerous weathering veins composed of calcite and iron-rich hydroxides. One edge of the section is less weathered and shows abundant discolored and partially-replaced troilite, much of it as rims around chondrules. Chondrules are distinct, and have an apparent mean diameter of 756±366 microns (N= 113). Two subtly different lithologies with indistinct boundaries are visible in thin section in optical and BSE imaging. One lithology (lithology A) has a somewhat higher proportion of forsteritic olivine grains than the other (lithology B); the overall lithology A clast appears slightly darker in BSE imaging. Chondrule mesostases in lithology A contain fewer crystallites than those of lithology B.

Geochemistry: Mineral compositions and geochemistry: Olivine and pyroxene grains are highly unequilibrated: Fa17.7±10.7N=161; Fs11.5±10.1Wo1.0±1.1, N=82. There is no significant difference in Fa or Fs contents between the two lithologies. However, Cr2O3 in olivine suggests a slightly different petrographic subtype: Cr2O3 in olivine (lithology A) = 0.42±0.19 wt%, consistent with a subtype of 3.10, N=72; Cr2O3 in olivine (lithology B) = 0.19±0.21 wt%, consistent with a subtype of 3.15, N=84.

Classification: Ordinary chondrite (L3.1) based on olivine fayalite content, overall Cr2O3 in olivine, and mean chondrule diameter.

Specimens: Cascadia holds 90.3 g in six pieces, in addition to a polished thin section and a mounted butt. The main mass is held by Sean Tutorow, Arizona.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):1866.52
Pieces:1
Class:L3.1
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):17.7±10.7 (N=161)
Ferrosilite (mol%):11.5±10.1 (N=82)
Wollastonite (mol%):1.0±1.1 (N=82)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):90.3
Type spec location:Cascadia
Main mass:Sean Tutorow, Tucson AZ
Comments:Lab number CML 1005; owner number G718; submitted by Melinda Hutson
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1448 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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