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| Northwest Africa 12884 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 12884 This is an OFFICIAL meteorite name. Abbreviation: NWA 12884 Observed fall: No Year found: 2015 Country: (Northwest Africa) Mass:  2.85 kg | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 225 approved meteorites classified as Eucrite-br. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 6 Oct 2019 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 108:
Northwest Africa 12884 (NWA 12884) (Northwest Africa) Purchased: 2015 Classification: HED achondrite (Eucrite, brecciated) History: Marc Jost (SJS) purchased the 2850 g sample in Rissani in January of 2015. Physical characteristics: The sample has an irregular shape and the exterior is light brown-tan in color. Clasts are visible on the exterior surface. The cut face shows the interior is a breccia composed of rounded to angular clasts with basaltic textures. Petrography: Sample is a cataclastic breccia composed of cm-sized, rounded, basaltic and rare cumulate-textured clasts set within a host of related mineral fragments. Clast show ophitic texture. Pyroxenes show exsolution textures and clouding. Additional minerals are: chromite, troilite, ilmenite, an Si polymorph and Ca phosphate minerals. Geochemistry: (A. Love, App) Low Ca pyroxene (Fs56.2±0.4Wo1.9±0.1 Fe/Mn=33.0±0.3, Mg#=42.7±0.4, N=12), high-Ca pyroxene (Fs23.1±0.5Wo44.6±0.4, Fe/Mn=30.9±0.9, N=12), plagioclase (An82.7±2.Or0.9±0.5, N=6). Classification: HED achondrite (Eucrite breccia). Based on ophitic texture and mineral compositions (Fe/Mn and Mg#) of pyroxenes, this sample is an equilibrated basaltic eucrite breccia M-S2 low weathering. Specimens: Marc Jost holds the main mass. A polished thin section and 2 slices totaling 25.5 g are on deposit at App. | ||||||||||||||||||||||||||||||||
| Data from: MB108 Table 0 Line 0: |
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| Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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| Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) | ||||||||||||||||||||||||||||||||