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Northwest Africa 13670
Basic information Name: Northwest Africa 13670
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13670
Observed fall: No
Year found: 1995
Country: (Northwest Africa)
Mass:help 55 kg
Classification
  history:
Recommended:  EL6    [explanation]

This is 1 of 121 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 30 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13670 (NWA 13670)

(Northwest Africa)

Purchased: 1995

Classification: Enstatite chondrite (EL6)

History: Purchased by Ken Regelman in 1995 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Mostly a recrystallized assemblage of enstatite with subordinate sodic plagioclase plus accessory iron hydroxides (after primary metal), altered daubreelite, schreibersite, Si-bearing kamacite (as blebs in enstatite), rare small grains (1-10 µm) of Fe-P-bearing carletonmooreite and minor secondary calcite. Rare RP chondrules are present in the studied thin section.

Geochemistry: Enstatite (Fs0.2±0.1Wo1.4±0.0, range Fs0.1-0.4Wo1.4, N = 5), plagioclase (Ab80.8±0.6An14.9±0.7Or4.3±0.2, range Ab80.3-81.4An15.6-14.2Or4.1-4.4, N = 3), kamacite (Ni = 2.8-3.9 wt.%, Si = 1.1-2.0 wt.%, N = 2), carletonmooreite (Ni = 79.9-80.2 wt.%, Fe = 7.2-5.0 wt.%, Si = 12.9-15.2 wt.%, P = 1.9-0.2 wt.%, N = 3 -- which yield the atomic formulas [Ni,Fe]2.91-2.95 [Si,P]1.08-1.03).

Classification: Enstatite chondrite (EL6).

Specimens: 119.6 g including one polished thin section at UWB; remainder with Mr. K. Regelman.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 1995
Mass (g):55000
Pieces:many
Class:EL6
Shock stage:S2
Weathering grade:W3
Ferrosilite (mol%):0.2±0.1
Wollastonite (mol%):1.4±0.0
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):119.6
Type spec location:UWB
Main mass:K. Regelman
Comments:Work name ARN20-1; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
ARN: Kenneth Regelman, Astronomical Research Network, 206 Bellwood Ave., Maplewood, MN 55117, United States; Website (private address)
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 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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