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Northwest Africa 15655
Basic information Name: Northwest Africa 15655
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15655
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 447 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 341 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 11 Feb 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15655 (NWA 15655)

(Northwest Africa)

Purchased: 2022

Classification: Lunar meteorite (feldspathic breccia)

History: Three stones weighing 94.0, 103.1, and 249.4 g were purchased in March 2022 by Shun-Chung Yang and Juan Chen from a meteorite dealer in Algeria.

Physical characteristics: Three stones with dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a breccia comprised of mm to cm-sized sub-angular lithic and mineral clasts set within a fine-grained fragmental matrix containing accessory ilmenite and merrillite. Clast lithologies identified include anorthosites, olivine norites, noritic anorthosites, and anorthositic norites.

Geochemistry: Olivine (Fa43.9±8.1, range Fa27.6-59.2, Fe/Mn=89±2, n=9), Low-Ca Pyroxene (Fs45.0±1.4Wo3.9±1.4, range Fs44.0-46.0Wo2.9-4.9, Fe/Mn=56±3, n=2), Pigeonite (Fs35.8±6.2Wo13.6±3.9, range Fs26.3-48.8Wo8.2-23.1, Fe/Mn=57±6, n=11), High-Ca Pyroxene (Fs20.3±1.5Wo38.9±2.3, range Fs19.3-21.3Wo37.2-40.5, Fe/Mn=49±4, n=2), Calcic Plagioclase (An96.3±1.3, range An92.4-98.7, n=20).

Classification: Lunar (feldspathic fragmental breccia) comprising a mix of FAN, MAN, and Mg-suite lithologies. An unusual 20 μm grain of near end-member enstatite (Fs0.4Wo1.2, Al2O3 wt. % ~0.6) was identified within the matrix.

Specimens: 20.09 g at Cascadia, main mass with Shun-Chung Yang and Juan Chen.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2022
Mass (g):446.5
Pieces:3
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):43.9±8.1
Ferrosilite (mol%):45.0±1.4,35.8±6.2, 20.3±1.5
Wollastonite (mol%):3.9±1.4, 13.6±3.9, 38.9±2.3
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.09
Type spec location:Cascadia
Main mass:Shun-Chung Yang and Juan Chen
Comments:CML 1540; 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
chen wang         
Elang Erlangga   
Robert Smart   
Public domain photographs:
Daniel Sheikh                           
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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