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Northwest Africa 10774
Basic information Name: Northwest Africa 10774
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10774
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 240 g
Meteoritical Bulletin:  MB 105  (2016)  L3
Recommended:  L3    [explanation]

This is 1 of 859 approved meteorites (plus 2 unapproved names) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 13 Jul 2016
Writeup from MB 105:

Northwest Africa 10774 (NWA 10774)

Morocco, Dahkla, (Northwest Africa)

Purchased: Oct 2015

Classification: Ordinary chondrite (L3)

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

Physical characteristics: Single stone, dark brown crust. The sawn surface shows dark-gray, very fine-grained, shock-melted veins up to 1 mm wide intersecting the coarse grained, brown chondritic matrix.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) The thin section displays several chondrules set in a medium grained matrix. The matrix is consisting of pyroxene and olivine and displays several melted portions, black in polarized light. Chondrules types are various (RP, BO, PO, POP, PP and C). Opaque phases account for about 10% of the total area and are mainly consisting of kamacite, taenite with minor troilite and iron oxides/hydroxides. Well distinguishable chondrules and the variability of Fa and Fs contents point to a petrologic type 3.7.

Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Olivine (Fa24.3±2.0, Fe/Mn=49±2, n=16; MD=0.76 PMD=2.40); low-Ca pyroxene (Fs14.4±8.6En84.9±8.7Wo0.7±0.5; Fe/Mn=31±2, n=15; MD=2.8 PMD=28.1); diopside (Fs15.0En65.0Wo19.9; 1.9 Al2O3, 1.8 Cr2O3, 1.1 MnO, all wt. %); plagioclase (Ab14.3An82.4Or3.3); Oxygen isotopes: (I.Franchi, R.Greenwood, OU) δ17O = 3.84 ‰, δ18O = 5.39 ‰, Δ17O = 1.03 ‰.

Classification: Ordinary Chondrite (L3) with suggested sub-type 3.7; S3; W2

Specimens: A total of 23.1 g specimen is on deposit at MSN-Fi. Castellano holds the main mass and one thin section.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Morocco, Dahkla
Place of purchase:Torino
Date:P Oct 2015
Mass (g):240
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):24.3±1.7 (N=16)
Ferrosilite (mol%):14.4±8.6 (N=15)
Wollastonite (mol%):0.7±0.1
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi
Type spec mass (g):23.1
Type spec location:MSN-FI
Main mass:Castellano
Comments:Submitted by Vanni Moggi Cecchi
Plots: O isotopes:  
   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)
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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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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