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Northwest Africa 13930
Basic information Name: Northwest Africa 13930
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13930
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 92 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13930 (NWA 13930)

Algeria

Find: 2020

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased online by Raymond Borges around October, 2020 from Mostafa Hnini.

Physical characteristics: Single stone with no fusion crust and containing small weathering veins.

Petrography: (D. Sheikh, FSU) Sample is a fragmental breccia containing angular to sub-rounded clasts (up to 1.3 cm) primarily composed of anorthite (some partially converted to maskelynite) and smaller amounts of olivine and pyroxene set in a fine-grained matrix containing areas of shock melt veins and vesicles. Accessory phases include troilite, SiO2-rich glass, chromite, and ilmenite.

Geochemistry: Olivine (Fa44.6±11.3, range Fa21.4-57.6, Fe/Mn=75±11, n=18), Low-Ca Pyroxene (Fs38.6±6.9 Wo3.5±0.9, range Fs30.6-50.6 Wo2.2-4.6, Fe/Mn=48±5, n=7), Pigeonite (Fs39.2±4.3Wo11.3±4.4, range Fs32.3-46.3Wo6.9-21.9, Fe/Mn=51±8, n=13), Augite (Fs21.7±3.2Wo39.8±2.2, range Fs16.3-23.8 Wo37.5-42.6, Fe/Mn=55±6, n=5), Plagioclase (An97.0±0.6, range An96.1-98.4, n=34).

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 19.3 g at Cascadia; main mass with Raymond Borges and Ily Valenzuela.

Data from:
  MB110
  Table 0
  Line 0:
Date:2020
Mass (g):92
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):44.6±11.3
Ferrosilite (mol%):38.6±6.9, 39.2±4.3, 21.7±3.2
Wollastonite (mol%):3.5±0.9, 11.3±4.4, 39.8±2.2
Classifier:D. Sheikh, FSU
Type spec mass (g):19.3
Type spec location:Cascadia
Main mass:Raymond Borges and Ily Valenzuela.
Comments:Submitted by Daniel Sheikh
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)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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