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Northwest Africa 7898
Basic information Name: Northwest Africa 7898
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7898
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 180 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CK5
Recommended:  CK5    [explanation]

This is 1 of 162 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 19 Jun 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7898 (NWA 7898)

Morocco

Purchased: Dec 2012

Classification: Carbonaceous chondrite (CK5)

History: Purchased by Jack Schrader from a meteorite dealer in Erfoud, Morocco, December 2012.

Physical characteristics: Single stone, black fusion crust, saw cut reveals chondrules of variable size set in a dark gray matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows distinct, equilibrated PO, POP chondrules, many in the range 300-800 μm, but some >1 mm. Chondrules commonly mantled by plagioclase or opaques. Ubiquitous high-Ca pyroxene, pigeonite, and Cr-rich magnetite.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa31.0±0.3, Fe/Mn=113±7, NiO=0.52±0.06 wt%, n=31; low-Ca pyroxene Fs28.0±1.0Wo1.1±1.3, Fe/Mn=78±5, n=14; plagioclase Or2±1Ab61±15An36±16, n=4; magnetite Cr2O3=3.8 wt%, n=2.

Classification: Carbonaceous chondrite (CK5), CK based on olivine Ni-content, Fa and Fe/Mn, presence of Cr-magnetite, and intermediate plagioclase composition. Type 5 based on olivine and pyroxene compositions with relatively low Fa,Fs-sigma.

Specimens: 20 g including a probe mount on deposit at UNM, Jack Schrader holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Dec 2012
Mass (g):180
Pieces:1
Class:CK5
Fayalite (mol%):31.0±0.3
Ferrosilite (mol%):28.0±1.0
Wollastonite (mol%):1.1±1.3
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Jack Schrader
Comments:Submitted by C. Agee, UNM
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. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1488 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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