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Northwest Africa 10074
Basic information Name: Northwest Africa 10074
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10074
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 44.9 g
Meteoritical Bulletin:  MB 104  (2015)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 92 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 23 Apr 2015
Writeup from MB 104:

Northwest Africa 10074 (NWA 10074)

(Northwest Africa)

Purchased: 2014

Classification: Primitive achondrite (Acapulcoite)

History: Purchased by Michael Farmer at the Tucson Gem and Mineral Show, 2014

Physical characteristics: Stone is ~70% covered in brownish fusion crust, with well-developed roll-over lip. Sawn surface is light greenish brown with a smattering of small (<0.5 mm) metal and troilite grains.

Petrography: Recrystallized into polygonal and subhedral grains, typically <0.3 mm, with occasional larger (to 1 mm) grains of orthopyroxene. Silicates have homogenous compositions. Many of the low-Ca pyroxene grains contain a core of small metal/troilite and rare chromite grains. These metal/troilite grains are typically <50 μm long and rounded to euhedral. Troilite covers ~7 areal % and Fe-Ni metal ~3 areal %. Most metal grains have high Ni rim and plessitic core. Kamacite is uncommon. Troilite unshocked and single crystal. Accessory chromite. Shock and weathering low.

Geochemistry: (L. Garvie, ASU) Olivine Fa11.4±0.1, FeO/MnO=21.2±1/0, n=10; low Ca pyroxene Fs10.8±0.1Wo1.4±0.3, FeO/MnO=13.3±0.8, Cr2O3=0.2±0.0 wt%, n=9; high Ca pyroxene Fs4.8±0.1Wo43.8±0.4, FeO/MnO=11.1±0.7, Cr2O3=1.3±0.0 wt%, n=7; Feldspar An14.3±0.2Or4.4±0.2, n=7. Large metal grains have Ni=13.3±0.5 wt% and Co=0.5±0.1 wt% (N = 13). Small metal grains in silicates have more variable Ni from 5.9 to 9.5 wt%. (K. Ziegler, UNM): Analyses of three acid-washed subsamples by laser fluorination dual inlet mass spectrometry gave, respectively, δ17O 1.176, 1.021, 0.991; δ18O 3.949, 3.724, 3.691; Δ17O -0.909, -0.945, -0.958 per mil (reference TFL slope = 0.528, values are linearized)

Classification: Acapulcoite

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2014
Mass (g):44.9
Shock stage:low
Weathering grade:low
Fayalite (mol%):11.4
Ferrosilite (mol%):10.8
Wollastonite (mol%):1.4
Classifier:L. Garvie, ASU; K. Ziegler, UNM
Type spec mass (g):9.2
Type spec location:ASU
Main mass:MFarmer
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)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
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 9559 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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