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Northwest Africa 10103
Basic information Name: Northwest Africa 10103
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10103
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 15.1 g
Meteoritical Bulletin:  MB 104  (2015)  LL7
Recommended:  LL7    [explanation]

This is 1 of 100 approved meteorites classified as LL7.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 7 May 2015
Writeup from MB 104:

Northwest Africa 10103 (NWA 10103)

(Northwest Africa)

Purchased: 2013

Classification: Ordinary chondrite (LL7)

History: A 15.1 g fusion crusted stone was acquired by CMS from the 2013 Tucson Gem and Mineral Show.

Physical characteristics: Stone covered with moderately wind-ablated brown fusion crust. Sawn surface shows a mix of rounded to angular light-gray to white clasts (to 1 cm), in a light olive-green crystalline matrix. Stone is very brittle. Weathering is minor. No chondrules visible.

Petrography: Clasts, which occupy ~70 area% of the stone, are highly recrystallized with hypidiomorphic to granular texture. Olivine grains to 0.6 mm in the clasts. Uneven distribution of grain sizes in the clasts may represent former chondrules. One possible BO chondrules visible. Abundant feldspar >100 μm. Metal and troilite occupy ~2 areal%. Accessory chromite to 400 μm. Interclast region greenish brown in thin section and crystalline.

Geochemistry: (L. Garvie, ASU) Olivine Fa31.5±1.2, FeO/MnO=61.1±4.0, N=14; low-Ca pyroxene Fs25.6±0.4Wo2.1±0.1, FeO/MnO=37.2±1.6, n=11; high-Ca pyroxene Fs11.0Wo42.8 and Fs10.9Wo42.8; Feldspar An10.2Or2.0 and An11.3Or2.9. (K. Ziegler, UNM): Analyses of three acid-washed subsamples by laser fluorination gave, respectively, δ17O 3.885, 3.834, 4.087; δ18O 5.175, 4.943, 5.444; Δ17O 1.153, 1.224, 1.213 (all per mil).

Classification: Ordinary chondrite (LL7, S1, W1). Oxygen isotopes plot within the overlapping fields for LL and L, though the olivine and pyroxene compositions are consistent with LL parentage. Absence of chondrules and recrystallized texture are consistent with petrologic grade 7.

Specimens: 15.1 g at ASU

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013
Mass (g):15.1
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):31.5
Ferrosilite (mol%):25.6
Wollastonite (mol%):2.1
Classifier:L. Garvie, UAz, K. Ziegler, UNM
Type spec mass (g):15.1
Type spec location:ASU
Main mass:ASU
Comments:Submitted by L. Garvie
Plots: O isotopes:  
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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