Meteoritical Bulletin: Entry for Northwest Africa 13670

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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: 55 kg

Classification
history:

Recommended:

EL6 [explanation]

This is 1 of 129 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

Writeup

help

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 (Fs_0.2±0.1Wo_1.4±0.0, range Fs_0.1-0.4Wo_1.4, N = 5), plagioclase (Ab_80.8±0.6An_14.9±0.7Or_4.3±0.2, range Ab_80.3-81.4An_15.6-14.2Or_4.1-4.4, 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 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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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