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Northwest Africa 13638
Basic information Name: Northwest Africa 13638
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13638
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 512 g
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 312 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jan 2021
Writeup from MB 110:

Northwest Africa 13638 (NWA 13638)


Find: 2020

Classification: Lunar meteorite (feldspathic breccia)

Physical characteristics: Physical: Single stone, weathered exterior without fusion crust; Cut surfaces reveal >25 vol% angular rock and mineral clasts in a black matrix

Petrography: (Y. Liu, JPL) Polished thick sections were observed using EMP and SEM. Rock clasts include angular fragments of basalts, anorthosite, and breccias. Graphic granite fragments are present, that contain a silica phase, orthoclase, zirconolite, tranquillityite, and apatite. Mineral fragments are mostly pyroxene and plagioclase with minor amounts of olivine and trace amounts of silica phases and apatite. Matrix is glassy and black. Terrestrial weathering in the form of carbonate in fractures, but no alteration rims on metals and sulfides.

Geochemistry: Mineral compositions (Y. Liu, JPL): Olivine, 55.4 ±24.0 (Fa96-33, molar Fe/Mn 94±16, n=9); Low-Ca pyroxene, Fs42.0±5.7Wo2.5±0.5 (Fs38-46Wo2-3, Fe/Mn 47±1, n =2); Pigeonite, Fs37.1±10.5Wo11.3±3.1 (Fs28-69Wo5-15, Fe/Mn=62.5±5.5, n=16), High-Ca pyroxene, Fs43.0±15.8Wo26.7±7.5 (Fs20-73Wo16-37, Fe/Mn=65.6±8.6, n = 37); Plagioclase, An91.8±4.5Ab7.5±4.2 (An83-99Ab1-16, n =23).

Classification: Achondrite (Lunar polymict melt breccia)

Specimens: 20 g at UCLA (A Rubin). The remainder is held by MtMorgan at Mile High Meteorites.

Data from:
  Table 0
  Line 0:
Mass (g):512
Class:Lunar (feldsp. breccia)
Weathering grade:minor
Classifier:Y. Liu, JPL
Type spec mass (g):20
Type spec location:UCLA
Main mass:M. Morgan, Mile High Meteorites
Finder:The nomad Dahmad
Comments:Submitted by Yang Liu
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
MtMorgan: Matt Morgan, Mile High Meteorites, P.O. Box 151293, Lakewood, CO 80215-9293, United States; Website (private address)
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 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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