Meteoritical Bulletin: Entry for Northwest Africa 11899

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Northwest Africa 11899

Basic information

Name: Northwest Africa 11899
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11899
Observed fall: No
Year found: 2017
Country: Mali
Mass: 16 kg

Classification
history:

Recommended:

Howardite [explanation]

This is 1 of 375 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 31 Aug 2018

Writeup

Writeup from MB 107:

Northwest Africa 11899 (NWA 11899)

Mali

Purchased: 2017

Classification: HED achondrite (Howardite)

History: Purchased by Dustin Dickens from Nomad in Mali.

Physical characteristics: Many identically appearing pieces. Fusion crusted exterior. A saw cut reveals a breccia with light and dark clasts set in light-brown matrix.

Petrography: (C. Agee, UNM) This meteorite is a polymict breccia consisting of approximately 60% diogenite and 40% eucrite clasts. Accessory Fe-Ni metal, Fe-sulfide, and silica observed.

Geochemistry: (C. Agee, UNM) diogenite low-Ca pyroxene Fs_25.1±2.5Wo_3.6±2.2, Fe/Mn=30±2, n=10; eucrite low-Ca pyroxene Fs_49.7±5.2Wo_4.8±2.8, Fe/Mn=29±2, n=7;.plagioclase AN93.1±1.2, n=7.

Classification: Howardite

Specimens: 22.8 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Mali
Date:	P 2017
Mass (g):	16000
Pieces:	Many
Class:	Howardite
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	25.1±2.5, 49.7±5.2
Wollastonite (mol%):	3.6±2.2, 4.8±2.8
Classifier:	C. Agee, UNM
Type spec mass (g):	22.8
Type spec location:	UNM
Main mass:	Dustin Dickens
Comments:	Field name DD-26; 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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, in preparation (2018)

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Wang Ziyao

Geography:

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 39 approved meteorites from Mali (plus 1 unapproved name)

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