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Northwest Africa 13533
Basic information Name: Northwest Africa 13533
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13533
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 464 g
Meteoritical Bulletin:  MB 109  (2021)  L6
Recommended:  L6    [explanation]

This is 1 of 12920 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Nov 2020
Writeup from MB 109:

Northwest Africa 13533 (NWA 13533)

(Northwest Africa)

Purchased: 2018 Mar 06

Classification: Ordinary chondrite (L6)

History: Purchased in Portland, Oregon from Patrick Thompson as an unclassified meteorite from northwest Africa that was obtained in Tucson, Arizona.

Physical characteristics: Single flattened individual that is covered in fusion crust except for broken face that has a weathering patina. A cut face reveals metal grains and chondritic texture with spatially variable weathering stains (more developed towards one face). Two shock veins are subparallel to the two main flat faces of the individual.

Petrography: (K. Maccini, A. Ruzicka, Cascadia): In thin section, chondritic texture with indistinct chondrules are visible. Chief phases include olivine and low-Ca pyroxene, opaques (chiefly metal with lesser troilite) comprising up to ~7 area%, and maskelynite. One end of the section is notably stained; the rest of the sample has limited patches of weather staining centered on metal. In the prevailing low-stained portion of the sample, weathering products compose <5 area%. Shock stages based on olivine correspond to a conventional shock stage of S4 and a weighted shock stage (Jamsja and Ruzicka, 2010) of 3.7±0.6 (N=40).

Geochemistry: Mineral compositions and geochemistry: Olivine and low-Ca pyroxene grains are highly equilibrated: Fa24.3±1.0 N=70; Fs21.2±0.9Wo1.3±0.4, N=29.

Classification: Ordinary chondrite (L6) based on olivine fayalite and pyroxene ferrosilite content and overall texture.

Specimens: Cascadia holds 457.2 g in three pieces, including the main mass, a slice, an end cut, as well as a polished thin section and butt.

Data from:
  Table 0
  Line 0:
Place of purchase:Portland OR
Date:P 2018 Mar 06
Mass (g):463.9
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):24.3±1.0 (N=70)
Ferrosilite (mol%):21.2±0.9 (N=29)
Wollastonite (mol%):1.3±0.4 (N=29)
Classifier:K. Maccini and A. Ruzicka, Cascadia
Type spec mass (g):457.2
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML 0995; submitted by Alex Ruzicka
   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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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