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Northwest Africa 11970
Basic information Name: Northwest Africa 11970
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11970
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 180.9 g
Meteoritical Bulletin:  MB 107  (2018)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 91 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 23 Sep 2018
Writeup from MB 107:

Northwest Africa 11970 (NWA 11970)

(Northwest Africa)

Find: 2015

Classification: Primitive achondrite (Lodranite)

History: Acquired from a Moroccan meteorite dealer at the 2016 Tucson Gem and Mineral show.

Physical characteristics: Four similar looking stones, the largest being 87.1 g. The uncut stones are light gray with clumped protruding dark brown/red nodules and scattered visible bright green angular mm-scale minerals. The cut stones show a breccia of <1 cm-sized silicate grains.

Petrography: Observations from a thin section show a breccia dominated by angular to sub-rounded silicate grains the largest to 1 cm. Minerals dominated by olivine, orthopyroxene, and clinopyroxene; some of the pyroxene is polysynthetically twinned. Minor phases include chromite, troilite, stained kamacite and taenite, and some composite metal grains. The metal is dominated by kamacite with minor tetrataenite. Metal grains (to 3 mm) are irregularly shaped (holly leaf-like), with polycrystalline structure dominated by >100 μm polygonal grains lacking Neumann bands. Troilite is dominantly single crystal.

Geochemistry: (E.T. Dunham, D. Kornau, T. Goodwyn, T. Fougner, N. Delafuente, and E. Smith, ASU) Olivine (Fa11.5-11.9 (avg=11.7), FeO/MnO=24.0-26.8 (avg=25.9), n=10), orthopyroxene, Fs11.3Wo1.8 (Fs10.4-12.4Wo0.1-4.0), FeO/MnO=15.1-27.1 (avg=19.6), n=11; clinopyroxene, Fs5.1Wo42.3 (Fs4.3-6.1Wo39.7-44.5), FeO/MnO=10.8-13.1 (avg=11.5), n=9.

Classification: Lodranite breccia. This material is likely paired with NWA 8118, NWA 8216, and NWA 8251

Specimens: 180.9 g including 4 thin sections at ASU

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Mass (g):180.9
Shock stage:low
Weathering grade:low
Fayalite (mol%):11.5-11.9
Ferrosilite (mol%):10.5-12.5; 4.3-6.1
Wollastonite (mol%):0.1-4.0; 39.7-44.5
Classifier:E.T. Dunham, D. Kornau, T. Goodwyn, T. Fougner, N. Delafuente, and E. Smith, ASU
Type spec mass (g):180.9
Type spec location:ASU
Main mass:ASU
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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