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Northwest Africa 13987
Basic information Name: Northwest Africa 13987
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13987
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1570 g
Classification
  history:
Recommended:  CK4    [explanation]

This is 1 of 119 approved meteorites classified as CK4.   [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 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13987 (NWA 13987)

(Northwest Africa)

Purchased: 2020

Classification: Carbonaceous chondrite (CK4)

History: Purchased by Craig Zlimen from an Algerian meteorite dealer.

Physical characteristics: Single stone, dark sandblasted exterior. Saw cut reveal numerous distinct chondrules set in a brown-fine-grained matrix. Scattered CAIs are visible throughout.

Petrography: (C. Agee, UNM) This meteorite has primarily type-II porphyritic chondrules. Fine grained feldspar was observed throughout. Approximately 90% of the pyroxene is diopsidic, with low-Ca pyroxene being a minor phase. Ubiquitous chromium-bearing magnetite was detected throughout.

Geochemistry: (A. Ross, UNM) Olivine Fa30.5±4.4, Fe/Mn=109±8, NiO=0.36±0.09 Cr2O3= 0.09±0.15 (wt%), n=7; diopside Fs4.0±5.1Wo41.8±5.5, n=5; magnetite Cr2O3=2.7±0.3 wt%.

Classification: Carbonaceous chondrite CK4. CK based on the presence of chromium-bearing magnetite and absence of metal. Presence of fine-grained recrystallized plagioclase suggests type 4 rather than type 3.

Specimens: 62 g including a probe mount on deposit at UNM, Craig Zlimen holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020
Mass (g):1570
Pieces:1
Class:CK4
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):30.5±4.4
Ferrosilite (mol%):4.0±5.1
Wollastonite (mol%):41.8±5.5
Classifier:C. Agee, UNM
Type spec mass (g):62
Type spec location:UNM
Main mass:Craig Zlimen
Comments:Submitted by C. Agee
Institutions
   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)
Catalogs:
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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