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| Northwest Africa 13644 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13644 This is an OFFICIAL meteorite name. Abbreviation: NWA 13644 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass:  165 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 46 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 Feb 2021 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13644 (NWA 13644) (Northwest Africa) Purchased: 2020 Classification: Ordinary chondrite (L, melt rock) History: The meteorite was purchased from a dealer in Morocco. Physical characteristics: Brownish rock without fusion crust. Petrography: The rock shows a fine-grained (100-200 µm typical grain size), equigranular texture of euhedral to subhedral olivine and orthopyroxene grains, the latter partly poikilitically enclosing olivine. Some low-Ca pyroxenes are overgrown by thin augite margins. The interstitial space between the crystals is filled with finely crystallized Si,Al-rich minerals. Opaque phases include chromite, sulfides, and FeNi metal, partly present as blebs in mesostasis. Olivine and low-Ca-pyroxene show minor compositional zoning. Neither feldspar nor relict chondrules have been found in the two sections studied. The meteorite contains shock melt veins and pockets. Geochemistry: Interstitial finely-crystallized material (all wt%; N=4): SiO2: 68.5, TiO2: 0.23, Na2O: 4.40, K2O: 0.67; Cr2O3: 0.03, MgO: 0.30, MnO: 0.02; CaO= 2.24; FeO: 0.92, Al2O3: 21.2, Total: 98.5 | ||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
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| Catalogs: |
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| 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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| Photos: |
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| Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) | ||||||||||||||||||||||||||||||