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Northwest Africa 12722
Basic information Name: Northwest Africa 12722
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12722
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 68 g
Recommended:  CK3    [explanation]

This is 1 of 79 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 20 Dec 2021
Writeup from MB 110:

Northwest Africa 12722 (NWA 12722)

(Northwest Africa)

Purchased: March 2018

Classification: Carbonaceous chondrite (CK3)

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

Physical characteristics: A single piece weighing 68 g with traces of fusion crust.

Petrography: (V. Moggi Cecchi, L. Fabrizi, G. Pratesi, UniFi) The thin section displays a chondritic texture, with scattered PO and POP chondrules set in an abundant medium to grained matrix (60 vol% from point counting, n=520). Chondrules are often rimmed by opaque phases, mainly consisting of iron oxides, and range from 600-800 μm in dimensions. POP chondrules display unequilibrated fayalitic olivine and Mg-rich orthopyroxene crystals with minor diopsidic pyroxene; matrix is fine grained and almost entirely composed by fayalitic olivine mixed with Ca-rich pyroxene and albitic mesostasis; opaque phases are mainly represented by iron oxides and magnetite grains inside chondrules.

Geochemistry: EPMA (V. Moggi Cecchi, G. Pratesi, UniFi); Olivine (Fa23.7±9.8Fo76.4±8.2; Fe/Mn = 132.9, n=12 ); Orthopyroxene in chondrule grains and in matrix (Fs13.9±7.2En84.8±5.4Wo1.3±0.1, Fe/Mn = 86.9, n=13); High-Ca pyroxene (Fs9.6±1.6En42.6±0.9Wo47.7±0.4, n=5); plagioclase (An15.1Or4.9). Magnetite has 4.2 wt% Cr2O3 (n2). Oxygen isotopes: (I.Franchi, R.Greenwood, OU) δ17O = -2.46 permil, δ18O = 1.61 permil, Δ17O = -3.30 permil.

Classification: Carbonaceous chondrite (CK3).

Specimens: A total of 16 g specimen is on deposit at MSN-FI, Inv.# I3373. Mimaghador holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P March 2018
Mass (g):68
Shock stage:moderate
Weathering grade:W4
Fayalite (mol%):23.7±9.8 (n=12)
Ferrosilite (mol%):13.9±7.2 (n=13)
Wollastonite (mol%):1.3±0.3
Classifier:V. Moggi Cecchi, L. Fabrizi, G. Pratesi, UniFi
Type spec mass (g):16
Type spec location:MSN-FI
Main mass:Ziyao Wang
Comments:Field label Mima 51 (see provisional table). Inv.# I3373.; 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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