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Northwest Africa 13788
Basic information Name: Northwest Africa 13788
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13788
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 2.6 kg
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Lunar (melt breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 28 Mar 2021
Writeup from MB 110:

Northwest Africa 13788 (NWA 13788)

Ouargla, Algeria

Find: 2020 Dec

Classification: Lunar meteorite (melt breccia)

History: Purchased in 2021 by Matthew and Travis Stream from a meteorite dealer in Algeria.

Physical characteristics: Specimen contains a dark-brown fusion crust. An interior slice reveals light and dark clasts within a darker matrix.

Petrography: (D. Sheikh, FSU) Sample is an impact melt breccia composed of angular to sub-rounded mineral and lithic clasts (<4 mm) set in a predominantly vitreous matrix composed of brown, flow-banded, vesicular, partly devitrified glass and fine-grained crystalline impact melt. Lithic clasts consist primarily of anorthitic plagioclase (some partially coverted to maskelynite) with smaller quantities of olivine, pigeonite, low-Ca pyroxene, sub-calcic augite, and Si-Na-Ca-Mg-rich glass; a variety of lithic clasts were observed to display poikilitic, granulitic, dendritic, porphyritic, or subophitic textures in thin section. Accessory phases present include kamacite, troilite, chromite (some containing Ti), and ilmenite.

Geochemistry: Olivine (Fa32.8±5.9, range Fa18.3-43.1, Fe/Mn=74±11, n=22), Low-Ca pyroxene (Fs34.5±13.1 Wo2.9±1.5, range Fs19.2-42.2 Wo1.5-4.4, Fe/Mn=46±13, n=3), Pigeonite (Fs34.4±9.7 Wo15.0±5.3, range Fs19.5-48.0 Wo6.4-23.7, Fe/Mn=47±6, n=11), Sub-calcic augite (Fs28.6±9.2 Wo31.8±4.5, range Fs14.4-39.2 Wo26.7-39.1, Fe/Mn=44, n=6), Anorthite (An96.1±0.7, range An94.5-97.8, n=42).

Classification: Lunar (melt breccia).

Specimens: 20.3 g at Cascadia; main mass with Matthew and Travis Stream.

Data from:
  Table 0
  Line 0:
Date:2020 Dec
Mass (g):2600
Class:Lunar (melt breccia)
Weathering grade:low
Fayalite (mol%):32.8±5.9
Ferrosilite (mol%):34.5±13.1, 34.4±9.7, 28.6±9.2
Wollastonite (mol%):2.9±1.5, 15.0±5.3, 31.8±4.5
Classifier:D. Sheikh, FSU
Type spec mass (g):20.3
Type spec location:Cascadia
Main mass:Matthew Stream
Comments:Submitted by Daniel Sheikh
   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)
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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     This is 1 of 43 approved meteorites from Ouargla, Algeria (plus 1 unapproved name)
     This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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