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Northwest Africa 12721
Basic information Name: Northwest Africa 12721
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12721
Observed fall: No
Year found: 2018
Country: Northwest Africa
Mass:help 105 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 12721 (NWA 12721)

Northwest Africa

Purchased: March 2018

Classification: Carbonaceous chondrite (CV3)

History: Collected by nomads in Western Sahara and purchased by Hichame Mimaghador at Erfoud from a Moroccan dealer.

Physical characteristics: A single piece weighing 105 g without fusion crust. CAIs are visible on the hand specimen cut surface.

Petrography: (V. Moggi Cecchi, G. Pratesi, UniFi); The thin section displays a chondritic texture, with GO, BO, PO and POP chondrules ranging from 800 to 1200 μm prevailing over matrix; a chondrule-matrix ratio of 1.2 can be estimated; no CAIs are visible in a small thin section; olivine in PO chondrules is Fa-poor and displays a core-rim zoning; olivine in BO chondrules is Fa-rich; orthopyroxene in POP chondrules is Mg-rich; an Al-rich pigeonite and rare augite is present in BO chondrules; matrix is fine-grained and consists of Fa-rich olivine and orthopyroxene with diffuse altered opaque phases (iron-oxides) and magnetite.

Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, UniFi); Olivine in PO chondrules (Fa1.7±0.2Fo98.3±0.7; Fe/Mn = 12.9, n=10 ); Olivine in BO chondrules (Fa29.9±4.2Fo70.1±0.9; Fe/Mn = 94.5, n=6); Orthopyroxene in POP chondrules (Fs3.0±0.8En96.1±0.7Wo0.8±0.1, Fe/Mn = 67.6, n=8); Pigeonite in BO chondrules (Fs2.2±0.2En91.8±2.1Wo6.0±2.1, Fe/Mn = 6.9, n=9), High-Ca pyroxene (Fs25.7±0.2En30.4±0.3Wo43.9±0.4, Fe/Mn = 60.6, n=6); plagioclase in POP chondrules (An97.7Or0.1).

Classification: Carbonaceous Chondrite (CV3)

Specimens: A total of 25 g specimen is on deposit at MSN-FI. Mimaghador holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P March 2018
Mass (g):105
Pieces:1
Class:CV3
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):1.7±0.2 (n=10); 29.9±4.2 (n=6)
Ferrosilite (mol%):3.4±0.8 (n=8); 2.2±0.2 (n=9); 25.7±0.2 (n=6)
Wollastonite (mol%):1.2±0.1; 5.9±0.1; 43.9±0.5
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, UniFi
Type spec mass (g):25
Type spec location:MSN-FI
Main mass:Mimaghador
Comments:Field label Mima 50; 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 5 approved meteorites from Northwest Africa (plus 3 unapproved names)

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