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This is a Full slice of the newly classified lunar feldsp. melt breccia meteorite NWA 18055     Weight 3.16 grams.  

 IMCA #2232

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I am Mike Miller meteoritefinder IMCA member #2232
Northwest Africa 18055
Basic informationName: Northwest Africa 18055
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 18055
Observed fall: No
Year found: 2025
Country: Algeria
Mass:help 462 g
Classification
  history:
Recommended:  Lunar (feldsp. melt breccia)    [explanation]

This is 1 of 3 approved meteorites classified as Lunar (feldsp. melt breccia).    [show all]
Search for other: Lunar meteorites
Comments:Approved 11 Nov 2025
Writeuphelp
Writeup from MB 114:

Northwest Africa 18055 (NWA 18055)

Algeria

Purchased: 2025 Aug

Classification: FixMe: Lunar meteorite (feldspathic melt breccia)

History: Samples are reportedly found 200 km from Adrar, Algeria. Mike Miller purchased 2 samples with a total weight of 462 g from Taguati Abdelhamid in Algeria in August of 2025.

Physical characteristics: The exterior of the sample is dark green and orange and shows a wind-ablated exterior. The cut face shows a brecciated texture composed of mostly grey-colored lithic clasts.

Petrography: Description and classification (A. Love, App) The sample is a complex breccia composed of cm-sized, rounded to angular clasts of troctolite, anorthosite, microporphyritic lithic clasts and rare subophitic-textured clasts set within a devitrified and schlieren-textured, vesicular melt-matrix. Some clasts show assimilation with shock melt. Additional minerals are: spinel, calcite and barite.

Geochemistry: (A. Love, App) olivine (Fa19.3±3.7, Fe/Mn=63.2-96.4, n=29; Fa38.4±3.0, Fe/Mn=75.4-90.8); pigeonite (Fs21.9±10.2Wo13.3±5.9, Fe/Mn=42.2-50.8, n=8); high Ca pyroxene (Fs24.4±3.5Wo29.0±3.8, Fe/Mn=43.8-50.8, n=2); plagioclase (An98.1±0.2Or0.0, n=14); pleonaste spinel (Sp91.6±4.6Chr6.8±3.4Usp1.5±1.6Mt0.1±0.2, Mg#=71.6±8.8, n=5).

Classification: Lunar achondrite (feldspathic melt breccia, M-S4, moderate weathering) Based on texture, Fe/Mn ratios within olivine and Ca pyroxene and presence of anorthitic feldspar, sample is a feldspathic melt breccia.

Specimens: Mike Miller holds the main masses. A polished thin section and 4 slices weighing a total of 22.20 g are on deposit at App.

Data from:
  MB114
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2025 Aug
Mass (g):462
Pieces:2
Class:Lunar (feldsp. melt breccia)
Shock stage:M-S4
Weathering grade:moderate
Fayalite (mol%):19.3±3.7
Ferrosilite (mol%):21.9±10.2
Wollastonite (mol%):13.3±5.9
Classifier:A. Love, App
Type spec mass (g):22.2
Type spec location:App
Main mass:Mike Miller
Comments:Submitted by Anthony Love
Institutions
   and collections		App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 2013-03-07)
Catalogs:
References:Published in Meteoritical Bulletin, no. 114, in preparation (2025)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
      This is 1 of 1588 approved meteorites from Algeria (plus 37 unapproved names) (plus 4 impact craters)
Also see:
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Revision
  history:
   This lists important revisions made to data for this record.