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Northwest Africa 12201
Basic information Name: Northwest Africa 12201
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12201
Observed fall: No
Year found: 2018
Country: Western Sahara
Mass:help 81 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Eucrite-unbr
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 136 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 9 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12201 (NWA 12201)

Western Sahara

Purchased: May 2018

Classification: HED achondrite (Eucrite, unbrecciated)

History: Found in Western Sahara, March 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone, weathered exterior. Saw cut reveals a dark gray surface with plagioclase and pyroxene crystals.

Petrography: (C. Agee) Microprobe examination of a polished mount shows a mixture of approximately 50% pyroxene and 40% plagioclase. Pyroxenes show a clear compositional separation of low-Ca and high-Ca pyroxene typical of equilibrated basaltic eucrites. No brecciation observed.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs57.1±1.4Wo3.8±2.4, Fe/Mn=33±1, n=8; high-Ca pyroxene Fs26.5±2.3Wo41.5±2.9, Fe/Mn=31±2, n=5; plagioclase An85.4±0.8, n=6.

Classification: Unbrecciated basaltic eucrite

Specimens: 17.1g including a probe mounts on deposit at UNM, DPitt holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P May 2018
Mass (g):81
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):57.1±1.4, 26.5±2.3
Wollastonite (mol%):3.8±2.4, 41.5±2.9
Classifier:C. Agee, UNM
Type spec mass (g):17.1
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH-362; submitted by C. Agee, UNM
Institutions
   and collections		 UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 280 approved meteorites from Western Sahara (plus 20 unapproved names)
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Revision
  history:
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