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Northwest Africa 14900
Basic information Name: Northwest Africa 14900
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14900
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 277 g
Classification
  history:
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 19 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 9 May 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14900 (NWA 14900)

(Northwest Africa)

Purchased: 13 March 2022

Classification: Lunar meteorite (frag. breccia)

History: Purchased on March 13, 2022, by Matthew Stream from Aliyen Faida’llah in Morocco.

Physical characteristics: Eight stones with slightly weathered fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample represents a lunar polymict breccia composed of angular to sub-rounded mm-sized lithic and mineral clasts set within a glassy to fine-grained matrix containing regions of isolated melt pockets, shock melt veins, schlieren, and vesicles. Lithic clast lithologies include: anorthositic clasts, noritic clasts, troctolitic clasts, impact melt-rich clasts, basaltic clasts, and a ~2 mm dunite clast; mineral clasts include isolated grains of olivine (some displaying strong normal zoning), pyroxene (some displaying exsolution lamellae), and plagioclase (mix of fractured and smooth grains). Accessory phases include ilmenite, silica glass, Cr-rich spinel, troilite, and Fe-Ni metal.

Geochemistry: Olivine (Fa23.4±12.8, range Fa9.0-44.6, Fe/Mn=85±8, n=21), Low-Ca Pyroxene (Fs32.6±13.2Wo4.0±0.9, range Fs17.9-46.7Wo2.8-5.1, Fe/Mn=51±6, n=5), Pigeonite (Fs30.1±6.7Wo11.1±3.3, range Fs19.5-40.8Wo6.9-20.2, Fe/Mn=50±6, n=19), High-Ca Pyroxene (Fs19.3±4.9Wo38.0±3.7, range Fs8.6-25.0Wo33.3-43.2, Fe/Mn=45±4, n=9), Calcic Plagioclase (An95.5±1.6, range An90.2-97.1, n=22); Dunite clast [Olivine (Fa9.1±0.1, range Fa9.0-9.1, Mg#=91, Fe/Mn=80±10, n=8), Cr-rich spinel (Cr#=80.6±2.2, Mg#=53.8±4.5, n=3)].

Classification: Lunar (fragmental breccia) due to polymict nature of the sample.

Specimens: 20.2 g at Cascadia, main mass with Matthew Stream.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 13 March 2022
Mass (g):277
Pieces:8
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):23.4±12.8
Ferrosilite (mol%):32.6±13.2, 30.1±6.7, 19.3±4.9
Wollastonite (mol%):4.0±0.9, 11.1±3.3, 38.0±3.7
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.2
Type spec location:Cascadia
Main mass:Matthew Stream
Comments:CML 1500; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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