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Northwest Africa 12892
Basic information Name: Northwest Africa 12892
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12892
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 24.9 g
Classification
  history:
Recommended:  Acapulcoite    [explanation]

This is 1 of 77 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12892 (NWA 12892)

(Northwest Africa)

Purchased: 2016

Classification: Primitive achondrite (Acapulcoite)

History: Purchased online in 2016 by George Penneff from Mohamed Salem el Wali el Alaoui in Morocco.

Physical characteristics: Single dark-brown stone with minor fusion crust.

Petrography: (D. Sheikh, FSU) Sample is highly recrystallized and contains abundant 120° triple junctions. Silicate major phases include angular to sub-rounded grains (Av. 180 μm) of olivine, low-ca pyroxene, high-ca pyroxene, and plagioclase. Fe-Ni metal grains (mostly kamacite, Av. 500 μm) occupy ~10% volume of the sample. Other phases include troilite, chromite, fluorapatite, and merrillite.

Geochemistry: (D. Sheikh, FSU) Olivine (Fa8.9±0.3, range Fa8.3-9.7, Fe/Mn=17±4, n=32), low-Ca Pyroxene (Fs9.8±0.3Wo2.5±0.4, range Fs9.3-10.4Wo1.7-3.1, Fe/Mn=11±2, n=26), high-Ca Pyroxene (Fs4.1±0.2Wo42.5±2.6, range Fs3.8-4.3Wo38.7-44.3, Cr2O3 1.4 wt%, Fe/Mn=6±1, n=4), plagioclase (An19.5±0.8Or2.5±0.4, range An18.7-20.4Or2.0-3.0, n=5), Chromite (Cr/(Cr+Al)=86.9, n=2), Kamacite (Ni wt%=6.6, n=11).

Classification: Acapulcoite

Specimens: 5.07 grams at UCLA; main mass with George Penneff.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):24.88
Pieces:1
Class:Acapulcoite
Shock stage:low
Weathering grade:low
Fayalite (mol%):8.9±0.3
Ferrosilite (mol%):9.8±0.3, 4.1±0.2
Wollastonite (mol%):2.5±0.4, 42.5±2.6
Classifier:D. Sheikh, FSU
Type spec mass (g):5.07
Type spec location:UCLA
Main mass:George Penneff
Comments:Submitted by Daniel Sheikh
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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