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Northwest Africa 8738
Basic information Name: Northwest Africa 8738
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8738
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 2.85 kg
Meteoritical Bulletin:  MB 105  (2016)  LL3-6
Recommended:  LL3-6    [explanation]

This is 1 of 28 approved meteorites classified as LL3-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 31 Mar 2016
Writeup from MB 105:

Northwest Africa 8738 (NWA 8738)

(Northwest Africa)

Purchased: 2009

Classification: Ordinary chondrite (LL3-6)

History: Purchased by Blaine Reed in Tucson, 2009.

Physical characteristics: Four fragments. Saw cuts show brecciated texture, dark and light clasts set in a light-gray groundmass, scattered metal/sulfide grains.

Petrography: (C. Agee) Microprobe examination of a polished mount reveals a polymict breccia with at least three distinct lithologies corresponding to LL3, LL6, and L6. Type 6 is ~75%, type 3 is ~25%. The type 3 lithology has some PO chondrules with igneous zoning, also PP chondrules with enstatitic pyroxenes, BO chondrules, all with mesostasis or glass, whereas the type 6 lithologies have a few relict chondrules, and appear to be mostly recrystallized, with equilibrated olivines and pyroxenes, and plagioclase >100 μm. Ubiquitous troilite, kamacite, chromite, and Cl-rich apatite.

Geochemistry: (C. Agee, UNM) L6 component: olivine 25.5±0.2, Fe/Mn=50±3, n=4; low-Ca pyroxene Fs22.7±0.4Wo1.2±0.4, Fe/Mn=33±1, n=4. LL6 component: olivine 29.4±0.9, Fe/Mn=60±3, n=17; low-Ca pyroxene Fs25.2±0.0Wo1.2±0.1, Fe/Mn=38±0, n=3. LL3 component: porphyritic pyroxene chondrule Fs4.4±0.4Wo0.2±0.1, Fe/Mn=12±1, n=4. Random olivines range Fa16.5-29.9, Fa25.8±5.2, Fe/Mn=55±9, n=10.

Classification: Ordinary chondrite (LL3-6), breccia of LL3, LL6, and L6 components, weathering grade W1, shock stage S4.

Specimens: 23.6 g including a probe mount on deposit at UNM, Reed holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2009
Mass (g):2851
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):25.5±0.2, 29.4±0.9, 25.8±5.2
Ferrosilite (mol%):22.7±0.4, 25.2±0.0
Wollastonite (mol%):1.2±0.4, 1.2±0.1
Classifier:C. Agee, UNM
Type spec mass (g):23.6
Type spec location:UNM
Main mass:Blaine Reed
Comments:Field name BR-49; submitted by C. Agee
   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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 6759 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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