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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:
Meteoritical Bulletin:  MB 109  (2021)  L3.1
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 Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2118 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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