Meteoritical Bulletin: Entry for Northwest Africa 10786

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Northwest Africa 10786

Basic information

Name: Northwest Africa 10786
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10786
Observed fall: No
Year found: 2015
Country: Western Sahara
Mass: 433 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	LL3
Recommended:			LL3 [explanation]

This is 1 of 466 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 1 Aug 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10786 (NWA 10786)

Western Sahara

Purchased: Oct 2015

Classification: Ordinary chondrite (LL3)

History: Collected by nomads in Western Sahara and purchased by Mario Di Martino at the Torino Mineral Fair in October 2015 from a Moroccan dealer.

Physical characteristics: Single stone, dark brown crust. The sawn surface shows a medium grained, brown chondritic matrix.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) The thin section displays a medium-grained matrix with several chondrules. The matrix is mainly consisting of pyroxene and olivine, with minor plagioclase.Chondrules range from 250 to 800 μm in diameter. Chondrules types are various (BO, PO, PP and C). Opaque phases, mainly consisting of kamacite, taenite with minor troilite and iron oxides/hydroxides, account for about 5% of the total area. Distinct chondrules and the variability of Fa and Fs contents point to high petrologic type 3.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Chondrules: olivine (Fa_27.0±4.6, Fe/Mn=61±6, n=14; MD=1.4 PMD=5.7); low-Ca pyroxene (Fs_19.0±6.9En_80.5±7.0Wo_0.5±0.1; Fe/Mn=32±2, n=7; MD=1.6 PMD=12.4); matrix: low-Ca pyroxene (Fs_24.0±0.2En_74.0±0.2Wo_2.0±0.5; Fe/Mn=40±1, n=5; MD=0.2 PMD=0.9); diopside (Fs_17.3En_79.4Wo_3.3; 1.6 Al₂O₃, 0.8 Cr₂O₃, 0.3 MnO, all wt. %); Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ¹⁷O = 3.66 ‰, δ¹⁸O = 5.28 ‰, Δ¹⁷O = 0.91 ‰

Classification: Ordinary Chondrite (LL3); S1; W2;

Specimens: A total of 38.0 g specimen and one thin section are on deposit at MSN-FI. Di Martino holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Torino
Date:	P Oct 2015
Mass (g):	433
Pieces:	1
Class:	LL3
Shock stage:	S1
Weathering grade:	W2
Fayalite (mol%):	27.0±4.6 (n=14)
Ferrosilite (mol%):	19.0±6.9 (n=7)
Wollastonite (mol%):	0.5±0.1
Classifier:	V. Moggi Cecchi, S. Caporali, G. Pratesi, MSN-FI
Type spec mass (g):	38.0
Type spec location:	MSN-FI
Main mass:	Di Martino
Comments:	Submitted by Vanni Moggi Cecchi

Plots:

O isotopes:

Institutions
and collections

OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Geography:

Western Sahara

Western Sahara

Coordinates:

Unknown.

Statistics:
This is 1 of 270 approved meteorites from Western Sahara (plus 20 unapproved names)

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