Meteoritical Bulletin: Entry for Northwest Africa 6105

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Northwest Africa 6105

Basic information

Name: Northwest Africa 6105
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6105
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass: 12 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 393 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 24 Apr 2012

Writeup

help

Writeup from MB 100:

Northwest Africa 6105 (NWA 6105)

(Northwest Africa)

Purchased: 2008 May 18

Classification: HED achondrite (Eucrite, polymict)

Petrography: Breccia consisting of clasts ranging in size from 1-5 mm within a matrix of pyroxene, plagioclase, opaque phases, phosphate, and in some glass. Textures indicative of shock metamorphism are common as are augite exsolution lamellae in host pigeonite. Minerals include pyroxene (low- and high-Ca), plagioclase, and silica with minor amounts of calcite, ilmenite, troilite, chromite, and Fe-Ni metal.

Geochemistry: Pyroxene: Mg# = 38-57, low-Ca = Fs_39.3-58.2Wo_0.9-10.0, and high-Ca = Fs_18.0-30.2Wo_32.8-46.3.Plagioclase: An_76-95.Oxygen isotopic compositions (R. Tanaka, OkaU, and D. Rumble, CIW, laser fluorination): duplicate analysis δ¹⁸O = 3.773, δ¹⁷O = 1.679, Δ¹⁷O = -0.308; and δ¹⁸O = 3.852, δ¹⁷O = 1.737, Δ¹⁷O = -0.291 (all per mil).

Classification: Achondrite (eucrite, polymict) with shock metamorphism. Pyroxene Mn/Fe = 0.033 consistent with HEDs.

Specimens: 12 g and 5 thin sections are on deposit at UTenn. L. A. Taylor holds the main mass.

Data from:
  MB100
  Table 1
  Line 1291:

Place of purchase:	Morocco
Date:	P 2008 May 18
Mass (g):	12
Pieces:	4
Class:	Eucrite-pmict
Ferrosilite (mol%):	39.3-58.2 (low-Ca); 18.0-30.2 (high-Ca)
Wollastonite (mol%):	0.9-10.0 (low-Ca); 32.8-46.3 (high-Ca)
Classifier:	A. Zhang and B. McFerrin (UTenn)
Type spec mass (g):	12
Type spec location:	UTenn
Main mass:	L. A. Taylor
Comments:	Submitted by Sheri Singerling

Plots:

O isotopes:

Institutions
and collections

UTenn: Planetary Geosciences Institute, Department of Earth and Planetary Sciences, University of Tennessee, 1412 Circle Drive, Knoxville, TN 37996-1410, United States (institutional address; updated 1 Nov 2011)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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