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Northwest Africa 10423
Basic information Name: Northwest Africa 10423
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10423
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 21 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 55 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Dec 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 10423 (NWA 10423)

Morocco, (Northwest Africa)

Purchased: Feb 2015

Classification: HED achondrite (Eucrite, cumulate)

History: A single stone of 21 g was found by nomads in Western Sahara and purchased by Giorgio Tomelleri at the Erfoud market in 2015.

Physical characteristics: The main mass has no fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): A cumulate eucrite mainly consisting of large (120-190 μm in width) orthopyroxene crystals and minor clinopyroxene and anorthitic plagioclase 100-200 μm wide crystals. Orthopyroxene crystals occasionally display very fine to fine augite exsolution lamellae ranging from 2 to 8 μm in width. Minor phases include ilmenite and chromite.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Calcic plagioclase An84.3±1Or0.8±0.1, n=8, low-Ca pyroxene (Fs61.9±1.4En35.6±1.2Wo2.6±0.1; n=6; Fe/Mn=36.76±0.13); pigeonite (Fs52.1±1.4En34.8±1.2Wo13.1±0.8; n=7; Fe/Mn=34.02±0.12); augite exsolution lamellae in low-Ca pyroxene (Fs27.5±1.2,En30.3±1.3Wo42.2±1.8; n=7; Fe/Mn = 32.21±0.11). Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 2.23 ‰, δ18O = 4.69 ‰, Δ17O = -0.204 ‰.

Classification: Eucrite-cm with low degree of shock and low degree of weathering.

Specimens: A total of 4.7 g specimen and one thin section is on deposit at MSN-Fi. Main mass with Giorgio Tomelleri

Data from:
  MB104
  Table 0
  Line 0:
State/Prov/County:Morocco
Place of purchase:Erfoud
Date:P Feb 2015
Mass (g):21
Pieces:1
Class:Eucrite-cm
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):61.9±1.4; 52.1±1.4
Wollastonite (mol%):2.6±0.1; 13.1±0.8
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, UniFi
Type spec mass (g):4.7
Type spec location:MSN-FI
Main mass:Tomelleri
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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Franco Vignato   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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