4.05g Lunar Fragmental Breccia Meteorite end piece I NWA 17581
On offer: 4.05 gram lend piece of the Lunar fragmental meteorite NWA 17581.
Dimensions: 28.89 mm x 13.92 mm x 8.65 mm
Official Name: Northwest Africa 17581
Abbreviation: NWA 17581
Observed fall: No
Year found: 2024
Country: Algeria
Classification: Lunar Fragmental Breccia
Description: This is a 4.05 gram amazing end piece of a lunar meteorite that was ejected from the Moon's surface when another meteorite struck that area of the Moon with enough force to send pieces into an Earth crossing trajectory. This end piece has been polished on the interior side and reveals a brecciated interior with a dark matrix and many lighter colored clasts.
What you get: 4.05 gram end piece of the lunar fragmental breccia meteorite as shown, shipping/storage membrane box, and a signed Certificate of Authenticity.
We offer a 100% no questions asked 30 day return policy.
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| Basic information |
Name: Northwest Africa 17581 This is an OFFICIAL meteorite name. Abbreviation: NWA 17581 Observed fall: No Year found: 2024 Country: Algeria Mass: 455 g |
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| Classification history: |
This is 1 of 52 approved meteorites classified as Lunar (frag. breccia). |
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| Comments: | Approved 1 Jun 2025 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 114:
Northwest Africa 17581 (NWA 17581) Algeria Purchased: 2024 Oct Classification: Lunar meteorite (frag. breccia) History: This lunar meteorite was purchased in October 2024 by Joshua Eisler and his partner from an Algerian meteorite dealer. Physical characteristics: A single dark colored roughly oblate spheroid shaped stone with several large light-colored clasts visible on the sand polished exterior. A single saw cut reveals a brecciated interior with a dark matrix and many lighter colored clasts ranging from approximately 1mm to 80mm. No fusion crust remains. Petrography: (D. Dickens, LMAC and M. Péan, LMAC) Analysis of a polished microprobe mount using WDS shows a predominantly feldspathic composition with numerous macroscale clasts set in a similar microscale matrix. Clasts and matrix are composed of mono and polymineralic fragments mostly of anorthite with minor Ca-pyroxenes and rare slightly ferroan olivine. Examination of BSE images with ImageJ software gives a mode of approximately 85% anorthite, 14% pyroxene, <1% olivine, and <1% opaques. Pyroxenes often show exsolution. Several grains were observed with approximately one half of the grain composed of high-Ca pyroxene and the other half of low-Ca pyroxene with a sharp linear transition between the two. Rare accessory kamacite is present as small submillimeter grains and veinlets, with veinlets often following shock fissures transecting multiple phases. A single highly shocked pyroxene grain was observed with abundant preferentially oriented 5 µm to 10 µm rod-like kamacite microstructures transecting exsolved lamellae off-set by intragranular shearing. Shock features such as melt veins and significant fracturing of mineral grains are present throughout the matrix and clasts. Kamacite was identified using BSE imaging and EDS but was not quantitatively analyzed. Geochemistry: (D. Dickens, LMAC and M. Péan, LMAC and A. S. Bell, UColo) Olivine Fa54.4±0.2, (wt%) Fe/Mn=99.5±5.8, n=7; low-Ca Pyroxene Fs46.9Wo2.7, (wt%) Fe/Mn=68.6 n=1; Pigeonite Fs36.6±3.9Wo10.3±6.9 Fe/Mn=54.7±5.5 (wt%) n=2; Augite Fs21.8±2.9Wo38.2±4.2, (wt%) Fe/Mn=59.8±5.4, n=5; Plagioclase An97.0±0.5Ab2.9±0.5, (wt%) n=16. Classification: Lunar fragmental breccia Specimens: 20 g at TCU |
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| Data from: MB114 Table 0 Line 0: |
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| Institutions and collections |
TCU: Oscar E. Monnig Collection, Department of Geology, Texas Christian University, Ft. Worth, TX 76129, United States; Website (institutional address; updated 2012-02-24) LMAC: Fill this in, United States (private address; updated 2025-12-09) UColo: Department of Earth Science University of Colorado Boulder UCB 399 Boulder, CO 80309-0399, United States; Website (institutional address; updated 2025-12-15) |
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| Catalogs: |
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| References: |
Published in Meteoritical Bulletin, no. 114, in preparation (2025)
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| Photos: |
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Geography:
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Statistics: This is 1 of 1610 approved meteorites from Algeria (plus 40 unapproved names) (plus 4 impact craters) |
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