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Northwest Africa 7027 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7027 This is an OFFICIAL meteorite name. Abbreviation: NWA 7027 Observed fall: No Year found: 2010 Country: Morocco Mass: 16 kg | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 16 approved meteorites classified as CO3.1. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites | ||||||||||||||||||||||||||
Comments: | Approved 12 Sep 2013 | ||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7027 (NWA 7027) Morocco Purchased: 2010 Classification: Carbonaceous chondrite (CO3.1) History: Purchased by Blaine Reed in September, 2010. Physical characteristics: Single stone, dark brown weathered fusion crust, saw-cut reveals many small chondrules in a fine-grained, dark brown matrix. Petrography: Microprobe examination of a polished mount shows numerous porphyritic chondrules many ~100 μm in diameter with range of ~50-500 μm. Glassy chondrule mesostasis, and ubiquitous opaque grain boundary matrix, sulfide-rich, also some irregularly shaped chondrules. Geochemistry: (C. Agee and L. Burkemper, UNM) Random chondrule olivine range Fa0.5-38.1, mean=Fa11.5, n=35, chondrule ferroan olivine mean Fa17.1±12.5, Cr2O3=0.20±0.11 wt%, Fe/Mn=88±71, n=23; enstatite Fs3.5±2.1Wo2.0±2.0, n=8; aluminous diopside Fs2.7±1.9Wo53.9±5.8, Al2O3=13.43±6.23 wt%. Classification: Carbonaceous chondrite (CO3.1) based on mean Cr2O3=0.20±0.11 wt% in chondrule ferroan olivines which is approximately midway between Colony CO3.0 (Cr2O3=0.36±0.10 wt%) and Rainbow CO3.2 (Cr2O3=0.08±0.05 wt%), Grossman and Brearley (2005). Specimens: 40 g including a probe mount on deposit at UNM, 24.1 g at PSF, Blaine Reed holds the main mass. | ||||||||||||||||||||||||||
Bibliography: |
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Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011) UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||
Crosslinks: |
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Revision history: |
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