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Northwest Africa 8534
Basic information Name: Northwest Africa 8534
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8534
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 60 g
Meteoritical Bulletin:  MB 103  (2014)  CM1/2
Recommended:  CM1/2    [explanation]

This is 1 of 25 approved meteorites classified as CM1/2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), CM chondrites, and CM-CO clan chondrites
Comments: Approved 16 Sep 2014
Writeup from MB 103:

Northwest Africa 8534 (NWA 8534)

(Northwest Africa)

Purchased: 2014 Jun 12

Classification: Carbonaceous chondrite (CM1/2)

History: Purchased 12 June 2014 in Morocco.

Physical characteristics: Many identically appearing small fragments, the largest being 2.6 g, with black, fresh fusion crust. Broken surface reveals black, uniform, very fine-grained texture, rare sub-mm CAIs, with no visible chondrules.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a matrix (80-90%) dominated by (Mg,Fe)-rich phyllosilicates, with scattered, small (~250 μm), mostly irregularly shaped chondrules, many of which contain secondary alteration phases. There is no mesostasis in any chondrule; they are all altered. This meteorite is transitional between CM1 and CM2. There is more fine-grained (80-90%, dominantly phyllosilicate) matrix than in CM2, but less than CM1. Calcium carbonate, (Ca,Mg)-carbonate, sulfides, and Fe-oxides are ubiquitous.

Geochemistry: (C. Agee and N. Muttik, UNM) Ferroan olivine Fa25.3±23.9, Fe/Mn=78±39, Cr2O3=0.40±0.09 (wt%), n=4; forsterite Fa1.4±0.4, Fe/Mn=15±14, n=16; aluminous diopside Fs2.9±1.6Wo47.4±9.6, n=3. Oxygen isotopes (K. Ziegler, UNM): acid-washed material analyzed in 8 replicates by laser fluorination gave, respectively δ18O=10.694, 15.433, 9.721, 12.571, 12.343, 13.254, 12.798, 12.440; δ17O=3.496, 6.442, 2.651, 4.363, 4.207, 4.863, 4.722, 4.450; Δ17O= -2.150, -1.706, -2.481, -2.274,-2.310, -2.135, -2.035, -2.118 (all per mil).

Classification: Carbonaceous chondrite (CM1/2), the petrologic type 1/2 is based on the relatively low abundance of chondrules and refractory inclusions, the high abundance of hydrous phases, and high volume percentage of matrix. It is also based on the mean value of eight oxygen isotope analyses that plots outside the field of CM2, at higher values δ17O=4.399±1.096 and δ18O=12.407±1.699 permil.

Specimens: 12 g including a probe mount on deposit at UNM, Robert Cucchiara and Ruben Garcia hold 48 g.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014 Jun 12
Mass (g):60
Weathering grade:low
Fayalite (mol%):25.3±23.9; 1.4±0.4
Ferrosilite (mol%):2.9±1.6
Wollastonite (mol%):47.4±9.6
Classifier:C. Agee, UNM
Type spec mass (g):12
Type spec location:UNM
Main mass:Robert Cucchiara and Ruben Garcia
Comments:Submitted by C. Agee
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Denis gourgues   
Dominik Stoeckli   
Woreczko Jan & Wadi   

     This is 1 of 6752 approved meteorites from (Northwest Africa) (plus 2052 unapproved names)

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