|
Northwest Africa 13971 | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 13971 This is an OFFICIAL meteorite name. Abbreviation: NWA 13971 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 2.5 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 52 approved meteorites classified as L-melt rock. [show all] Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 21 Jun 2021 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northwest Africa 13971 (NWA 13971) (Northwest Africa) Purchased: 2019 Classification: Ordinary chondrite (L, melt rock) History: The meteorite was acquired by the mass holder in Mauritania. Physical characteristics: Brownish rock with some patched of fusion crust. Petrography: The rock shows an igneous texture of euhedral to subhedral olivine and orthopyroxene 50-100 µm grains with interstitial Si,Al-rich mesostasis. Pyroxene often poikilitically encloses olivine. Olivine and low-Ca-pyroxene show minor compositional zoning and some low-Ca pyroxenes are overgrown by thin Ca-pyroxene margins. Opaque phases include chromite, sulfides, rare FeNi metal, and abundant alteration products. No relict chondrules have been found in the section studied. The meteorite contains shock veins and melt pockets. Geochemistry: olivine: Fa24.6±0.5 (Fa23.7-25.3, FeO/MnO=44±2, n=15); low-Ca pyroxene: Fs18.4±1.1Wo2.9±1.2 (Fs16.7-20.4Wo1.4-4.6, FeO/MnO=29±2, n=15); Ca-pyroxene rims: Fs15.4±2.5Wo23.2±10.5 (Fs12.6-18.7Wo8.9-34.2, FeO/MnO=22±2, n=6); mesostasis (wt%): SiO2: 70.9±2.3, Al2O3: 22.2±1.3, Na2O: 2.5±1.3, K2O: 0.49±0.02, CaO: 2.00±0.23, MgO: 0.33±0.39, FeO: 1.27±0.87, TiO2: 0.25±0.05, N=6 Classification: Melt rock. Mineral chemistry of olivine and low-Ca pyroxene suggest strong affinity to L chondrites. | ||||||||||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
|
||||||||||||||||||||||||||||||
Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
||||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||||
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
| ||||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|