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| Northwest Africa 15642 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 15642 This is an OFFICIAL meteorite name. Abbreviation: NWA 15642 Observed fall: No Year found: 2012 Country: (Northwest Africa) Mass:  568 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 444 approved meteorites classified as LL3. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
| Comments: | Approved 29 Jan 2023 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 112:
Northwest Africa 15642 (NWA 15642) (Northwest Africa) Purchased: 2012 Classification: Ordinary chondrite (LL3) History: Purchased from a Moroccan mineral dealer at the mineral show in Sainte-Marie-aux-Mines, France Physical characteristics: Individual stone with ~80% black fusion crust Petrography: (K. Metzler, IfP) Unbrecciated ordinary chondrite of low petrologic type, consisting of closely packed chondrules with very low amounts of interchondrule matrix. In some areas a cluster chondrite texture can be observed. The mean apparent chondrule size of 87 measured chondrules is 602±295 µm (250-1740 µm). Some chondrules with sizes up to ~9 mm occur. Accessory phases are Fe-Ni metal and troilite, mostly residing outside of chondrules. Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa25.6±8.2 (Fa1.2-32.5; n=30); the mean low-Ca pyroxene composition is Fs11.2±6.9Wo0.9±0.5 (Fs1.8-25.8Wo0.3-1.8; n=9). Classification: LL chondrite, based on low metal content, mineral chemistry, and mean apparent chondrule size. Petrographic type 3, based on the large chemical variation of olivine and pyroxene. Estimated petrographic subtype 3.6 based on the PMD of Fa values: 32.1%. | ||||||||||||||||||||||||||||||
| Data from: MB112 Table 0 Line 0: |
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| Institutions and collections |
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||