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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 39 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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| Photos: |
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| Geography: |
Statistics: This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names) | ||||||||||||||||||||||||||||||