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Northwest Africa 12986
Basic information Name: Northwest Africa 12986
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12986
Observed fall: No
Year found: 2016
Country: Morocco
Mass:help 189 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 230 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Dec 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12986 (NWA 12986)

Morocco

Find: 2016

Classification: HED achondrite (Eucrite, monomict)

History: Purchased in 2017 by Matthew Stream from a seller in Morocco.

Physical characteristics: Single stone with minor fusion crust.

Petrography: (Daniel Sheikh, FSU) Sample is a fine-grained monomict breccia composed of subophitic eucrite clasts containing orthopyroxene, pigeonite, augite, calcic plagioclase, SiO2-rich glass, and troilite. Minor secondary calcite veins present.

Geochemistry: (Daniel Sheikh, FSU) Orthopyroxene (Fs64.0±1.4Wo4.2±0.7, range Fs62.0-65.9Wo3.2-5.3, Fe/Mn=27±2, n=10), pigeonite (Fs54.9±4.1Wo14.4±5.1, range Fs47.2-61.0Wo6.2-24.3, Fe/Mn=29±3, n=35), augite (Fs42.0±4.1Wo30.4±5.0, range Fs33.5-48.1Wo25.7-41.2, Fe/Mn=29±3, n=17), calcic plagioclase (An84.1±2.1, range An80.1-89.1, n=44).

Classification: Eucrite (monomict breccia).

Specimens: 22 grams at UCLA; main mass with Matthew Stream.

Data from:
  MB108
  Table 0
  Line 0:
Date:2016
Mass (g):189
Pieces:1
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):64.0±1.4, 54.9±4.1, 42.0±4.1
Wollastonite (mol%):4.2±0.7, 14.4±5.1, 30.4±5.0
Classifier:D. Sheikh, FSU
Type spec mass (g):22
Type spec location:UCLA
Main mass:Matthew Stream
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)
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1438 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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