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| Northwest Africa 16390 | |||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 16390 This is an OFFICIAL meteorite name. Abbreviation: NWA 16390 Observed fall: No Year found: 2023 Country: (Northwest Africa) Mass:  17 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 641 approved meteorites classified as CM2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites | ||||||||||||||||||||||||||||
| Comments: | Approved 20 Feb 2024 | ||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 113:
Northwest Africa 16390 (NWA 16390) (Northwest Africa) Purchased: 2023 Classification: Carbonaceous chondrite (CM2) Petrography: (J. Gattacceca, CEREGE) Chondrules with average apparent diameter 290±130 µm (n=15) and chondrule fragments set in a fine-grained iron-rich matrix (67 vol%). Most chondrules have a fine-frained dust rimmed with radial cracks. Opaque minerals are troilite and pyrrhotite, magnetite. Metal is found almost exclusvely as inclusions in anhydrous silicates. IR spectra of bulk material (T. Prestgard, IPAG) are dominated by signatures of hydrated silicates, similar to those observed in CM2 chondrites. These spectra indicate that the extent of aqueous alteration is likely somewhat comparable to that of Murchison. Geochemistry: Olivine Fa7.5±10.6, range Fa0.3-32.3, Fa PMD 81% (n=17), Cr2O3 in ferroan olivine is 0.40±0.10 (n=14). Matrix defocused analyses FeO 37.0 wt%, analytical totals 82.1 wt%. Classification: Carbonaceous chondrite (CM2). Type 2 designation based on the presence of phyllosilicates indicated by the low microprobe analytical totals of the matrix, and the IR spectroscopy. Specimens: Type specimen at CEREGE. main mass with Kuntz. | ||||||||||||||||||||||||||||
| Data from: MB113 Table 0 Line 0: |
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| Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 10 Jun 2023) Kuntz: Fabien Kuntz, France; Website (private address) IPAG: Institut de Planétologie et d’Astrophysique de Grenoble 414, Rue de la Piscine Domaine Universitaire 38400 St-Martin d’Hères , France (institutional address; updated 1 Aug 2013) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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| Geography: |
Statistics: This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names) | ||||||||||||||||||||||||||||