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Northwest Africa 12847
Basic information Name: Northwest Africa 12847
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12847
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 15 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 12847 (NWA 12847)

(Northwest Africa)

Purchased: Mar 2017

Classification: Carbonaceous chondrite (CV3)

History: Collected by nomads in Western Sahara and purchased by Romano Serra at the Bologna Mineral Show in 2017 from a Moroccan dealer.

Physical characteristics: A single small piece without fusion crust. CAIs are visible on the cut surface.

Petrography: (V. Moggi Cecchi, G. Pratesi, UniFi); The thin section displays a chondritic texture, with PO, POP and BO chondrules ranging from 750 to 1300 μm in a fine grained matrix. PO and POP chondrules display zoned, Mg-rich olivine crystals and elongated pyroxene grains. Orthopyroxene in chondrules is rather homogeneous. Iron oxides are prevailing among opaque phases; Fe-Ni alloys and troilite can alse be observed as individual grains in the matrix or rimming chondrules.

Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, UniFi); Olivine in PO chondrules cores (Fa1.1±1.0Fo98.9±1.0; Fe/Mn = 6.8, n=12 ); Olivine in matrix (Fa32.5±3.4Fo68.5±3.4; Fe/Mn = 63.5, n=11 ); Orthopyroxene in chondrules and in matrix (Fs1.1±0.1En97.5±0.6Wo1.4±0.2, Fe/Mn = 18.6, n=11).

Classification: Carbonaceous Chondrite (CV3); S1; W2

Specimens: A total of 3.2 g specimen is on deposit at MSN-FI. OAM holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Bologna
Date:P Mar 2017
Mass (g):15
Pieces:1
Class:CV3
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):1.1±1.0 (n=8)
Ferrosilite (mol%):1.1±0.1 (n=11)
Wollastonite (mol%):1.4±0.2
Classifier:V. Moggi Cecchi, G. Pratesi, MSN-FI
Type spec mass (g):3.2
Type spec location:MSN-FI
Main mass:OAM
Finder:Anonymous
Comments:Submitted by Vanni Moggi Cecchi
Institutions
   and collections
OAM: Museo del Cielo e della Terra Vicolo Baciadonne 1 40017 San Giovanni in Persiceto ( BO) Italy Osservatorio Astronomico e Museo "Giorgio Abetti", San Giovanni Persiceto, Bologna, Italy; Website (institutional address; updated 31 Oct 2012)
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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