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Northwest Africa 12859 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12859 This is an OFFICIAL meteorite name. Abbreviation: NWA 12859 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 498 g | ||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 710 approved meteorites (plus 2 unapproved names) classified as H3. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||||
Comments: | Approved 9 Aug 2019 | ||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12859 (NWA 12859) (Northwest Africa) Purchased: 2018 Classification: Ordinary chondrite (H3) History: Marc Jost purchased the sample from Abdelaziz Mouadine at the 2018 Munich Mineral show on October 24th, 2018. Physical characteristics: The 498 g sample has a rounded, flattened shape with some broad shallow regmaglypts on one side. The exterior is completely covered by a weathered, brown fusion crust. The cut face shows the interior is compose of densely packed, well-formed chondrules. Petrography: Description and classification (A. Love, App) Sample has a chondritic texture composed of distinct 634 μm (avg. dia.) chondrules and fragments set in a matrix of FeNi metal and FeS. Porphyritic chondrules contain turbid mesostasis and many chondrules display rims composed of FeS. Clinoenstatite is the dominant pyroxene. Sample has ~8 % FeNi metal. Additional minerals are chromite and merrillite. Geochemistry: (A.Love-App) Olivine (Fa10.5±4.4 (Fa4.9-18.2), Fe/Mn=37.5±9.9, mean Cr2O3 in ferroan olivine=0.1±0.0, N=8), low Ca pyroxene Fs16.2±11.9Wo1.3±1.3 (Fs2.4-31.9Wo0.3-4.5), Fe/Mn=26.2±13.2, N=13. Classification: Ordinary chondrite (H3, C-S3, W1 estimated subtype 3.6). H chondrite based on magnetic susceptibility metal abundance and mineral compositions. Sample is >3.5 based on lack of red CL in chondrules (Huss et al., 2006). Mesostasis glass was not observed, indicating sample is 3.6-3.7. Specimens: Marc Jost (SJS) holds the main mass. 2 slices weighing 25.1 g, a polished mount and polished thin section and mount are on deposit at App. | ||||||||||||||||||||||||||||||||||
Bibliography: |
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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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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