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Northwest Africa 12925
Basic information Name: Northwest Africa 12925
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12925
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 3.8 kg
Meteoritical Bulletin:  MB 108  (2020)  CK5
Recommended:  CK5    [explanation]

This is 1 of 209 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 21 Nov 2019
Writeup from MB 108:

Northwest Africa 12925 (NWA 12925)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CK5)

History: Purchased Dec. 2018 by Dustin Dickens in Morocco from anonymous dealer.

Physical characteristics: Dark, fusion crusted exterior, saw cut and broken surfaces reveal a very dark gray interior, some scattered CAIs visible, a few large (>1mm) chondrules are present. Friable.

Petrography: (C. Agee, UNM) This meteorite consists numerous texturally equilibrated chondrules, ubiquitous Cr-bearing magnetite and pentlandite. Olivine is nickel-bearing. Matrix appears to be recrystallized with some fine-grained plagioclase.

Geochemistry: (C. Agee, UNM) Olivine Fa30±0.8, Fe/Mn=102±8, NiO=0.48±0.05 (wt%), n=20; low-Ca pyroxene Fs26.8±0.9Wo1.2±1.3, Fe/Mn=68±7, n=6; clinopyroxene Fs13.8±4.4Wo34.9±11.9, Fe/Mn=58±7, n=6. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 1.584, 1.005, 1.067; δ17O= -3.141,-3.415, -3.581; Δ17O= 3.242, 2.808, 2.958 (linearized, all per mil, TFL slope=0.528).

Classification: Carbonaceous chondrite CK5.

Specimens: 20.5 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):3800
Shock stage:low
Weathering grade:low
Fayalite (mol%):30±0.8
Ferrosilite (mol%):26.8±0.9, 13.8±4.4
Wollastonite (mol%):1.2±1.3, 34.9±11.9
Classifier:C. Agee, UNM
Type spec mass (g):20.5
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-50; submitted by C. Agee, UNM
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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