Meteoritical Bulletin: Entry for Northwest Africa 10206

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Northwest Africa 10206

Basic information

Name: Northwest Africa 10206
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10206
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 122 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	CO3.0
Recommended:			CO3.0 [explanation]

This is 1 of 22 approved meteorites classified as CO3.0. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 18 Jul 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 10206 (NWA 10206)

(Northwest Aftica)

Purchased: 2015

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased by Adam Aaronson in Morocco, 2015.

Physical characteristics: Smooth abraded fusion crust exterior; saw cut reveals very small chondrules in a very fine-grained, dark brown groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules with apparent mean diameter 145±125 μm, n=63. Fine-grained matrix makes up about 30% of this meteorite. FeNi-metal, troilite, iron oxide, diopside, and plagioclase were detected.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa_15.4±17.4, Fe/Mn=54±40, n=29; ferroan chondrule olivine Fa_27.0±15.7, Fe/Mn=80±32, Cr₂O₃=0.33±0.12 (wt%), n=16; enstatite Fs_2.5±2.5Wo_2.2±1.5, Fe/Mn=14±6, n=10.

Classification: Carbonaceous chondrite (CO3.0), 3.0 subtype based on Cr₂O₃ content of ferroan olivine (Grossman and Brearley, 2005). Values are similar to Colony (CO3.0) and Y-81020 (CO3.0).

Specimens: 20.0 g including a probe mount on deposit at UNM; Aaronson holds the main mass.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2015
Mass (g):	122
Pieces:	1
Class:	CO3.0
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	15.4±17.4
Ferrosilite (mol%):	2.5±2.5
Wollastonite (mol%):	2.2±1.5
Classifier:	C. Agee, UNM
Type spec mass (g):	20.0
Type spec location:	UNM
Main mass:	Aaronson
Comments:	M1822; submitted by C. Agee

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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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