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Northwest Africa 8061
Basic information Name: Northwest Africa 8061
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8061
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 876 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  H3.10
Recommended:  H3.10    [explanation]

This is 1 of 4 approved meteorites classified as H3.10.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 5 Dec 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 8061 (NWA 8061)

Morocco

Purchased: 2013

Classification: Ordinary chondrite (H3.10)

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, 2013.

Physical characteristics: 21 fragments that fit together to form 3 matching stones. Weathered exterior, saw cuts on all fragments reveal the same reddish brown interior, with small chondrules visible.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows many distinct, porphyritic chondrules, most with glass or mesostasis, also some irregular shaped or fragmental chondrules. Apparent mean chondrule size 286±225 μm, median 200 μm, n=70. Some of the abundant iron metal appears to be oxidized a seen in the widespread oxide veining. Opaque matrix throughout. Accessory melilite, fassaite, sulfide, chromite.

Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Chondrule ferroan olivine Fa14.9±6.2, Fe/Mn=46±24, Cr2O3=0.34±0.11 wt%, n=21; chondrule olivine range Fa0.3-26.8, n=33; low Ca-pyroxene Fs10.5±8.2Wo1.7±1.7, Fe/Mn=25±25, n=24. (Karen Ziegler, UNM) Oxygen isotope values of 4 acid-washed aliquots of bulk sample, 1.3, 1.4, 1.4, 1.7 g, gave δ17O = 3.676, 3.040, 3.434, 3.139, δ18O = 5.521, 5.632, 6.320, 5.652, Δ17O = 0.761, 0.066, 0.097, 0.155 (linearized, all permil).

Classification: Ordinary chondrite (H3.10). Type 3.10 is based on mean Cr2O3 content and sigma of ferroan olivine in porphyritic chondrules using the scheme of Grossman and Brearley (2005). The sigma of 0.11 is anomalously low compared to other 3.10 ordinary chondrites, and instead resembles the mean Cr2O3 and sigma of Colony, Y-81020 (CO3.1), and Acfer 094 (C2-ung). Weathering W2.

Specimens: 25.1 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):876.22
Pieces:21
Class:H3.10
Fayalite (mol%):0.3-26.8
Ferrosilite (mol%):10.5±8.2
Wollastonite (mol%):1.7±1.7
Classifier:C. Agee, UNM
Type spec mass (g):25.1
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Submitted by C. Agee
Plots: O isotopes:  
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1405 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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