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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
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 329 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 11 Feb 2023
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:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2022
Mass (g):446.5
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
   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)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
chen wang         
Elang Erlangga   
Public domain photographs:
Daniel Sheikh                           

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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