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Northwest Africa 12850
Basic information Name: Northwest Africa 12850
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12850
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 42 g
Classification
  history:
Recommended:  CV3    [explanation]

This is 1 of 515 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 29 Nov 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12850 (NWA 12850)

(Northwest Africa)

Purchased: Oct 2017

Classification: Carbonaceous chondrite (CV3)

History: Collected by nomads in Western Sahara and purchased by Mario Di Martino at the Torino Mineral Show in 2017 from a Moroccan dealer.

Physical characteristics: A single piece weighing 42 g displaying chondrules and without fusion crust. The cut surface displays scattered CAIs.

Petrography: (V. Moggi Cecchi, G. Pratesi, UniFi); In thin section a chondritic texture consisting of PO and POP chondrules ranging from 600 to 1500 μm in a fine-grained matrix is visible. PO chondrules display zoned olivine crystals. Olivine in PO and POP chondrules is markedly inhomogenesous with Mg-rich cores, while is more Fe-rich in the matrix. Orthopyroxene in chondrules is homogeneous. Iron oxides, Fe-Ni alloys and troilite are the most common opaque pohases, present as individual grains scattared in the matrix or rimming chondrules. Rounded metal aggregates are visible in some chondrules.

Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, UniFi); Olivine in cores of chondrule grains (Fa1.6±0.3Fo98.4±0.3; Fe/Mn = 13.4, n=11); Olivine in matrix (Fa34.9±3.6Fo65.1±3.4; Fe/Mn = 66.6, n=15 ); Orthopyroxene in chondrule grains and matrix (Fs4.3±1.5En94.9±1.2Wo0.8±0.1, Fe/Mn = 6.5, n=10).

Classification: Carbonaceous Chondrite (CV3); S1; W3

Specimens: A total of 8.6 g specimen is on deposit at MSN-FI. Di Martino holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Torino
Date:P Oct 2017
Mass (g):42
Pieces:1
Class:CV3
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):1.6±0.3 (n=11); 34.9±3.6 (n=15)
Ferrosilite (mol%):4.8±1.5 (n=11)
Wollastonite (mol%):0.8±0.1
Classifier:V. Moggi Cecchi, G. Pratesi, MSN-FI
Type spec mass (g):8.6
Type spec location:MSN-FI
Main mass:Di Martino
Finder:Anonymous
Comments:Submitted by Vanni Moggi Cecchi
Institutions
   and collections
MSN-FI: MUSEO DI STORIA NATURALE DELL'UNIVERSITA' DEGLI STUDI DI FIRENZE Via Giorgio La Pira, 4 – 50121 FIRENZE, Italy; Website (institutional address; updated 14 Jan 2015)
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. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7048 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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