Meteoritical Bulletin: Entry for Northwest Africa 12892

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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: 24.9 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Acapulcoite
Recommended:			Acapulcoite [explanation]

This is 1 of 91 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Comments:

Approved 11 Oct 2019

Writeup

help

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 (Fa_8.9±0.3, range Fa_8.3-9.7, Fe/Mn=17±4, n=32), low-Ca Pyroxene (Fs_9.8±0.3Wo_2.5±0.4, range Fs_9.3-10.4Wo_1.7-3.1, Fe/Mn=11±2, n=26), high-Ca Pyroxene (Fs_4.1±0.2Wo_42.5±2.6, range Fs_3.8-4.3Wo_38.7-44.3, Cr₂O₃ 1.4 wt%, Fe/Mn=6±1, n=4), plagioclase (An_19.5±0.8Or_2.5±0.4, range An_18.7-20.4Or_2.0-3.0, 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 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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