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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 112 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7859 approved meteorites from (Northwest Africa) (plus 1961 unapproved names)

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