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Northwest Africa 6434
Basic information Name: Northwest Africa 6434
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6434
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 423 g
Meteoritical Bulletin:  MB 103  (2014)  H6-an
Recommended:  H6-an    [explanation]

This is the only approved meteorite classified as H6-an.
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 6 Jun 2014
Writeup from MB 103:

Northwest Africa 6434 (NWA 6434)

(Northwest Africa)

Purchased: 2009

Classification: H6-an

History: Purchased by B. Reed in Tucson, 2009.

Physical characteristics: Eight pieces, identical in appearance, with dark brown weathered exterior. Saw cut reveals fine-grained metal/sulfide set in a dark brown matrix, faint chondrules barely detectable.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount reveals an equilibrated ordinary chondrite texture, a few chondrules (up to 400 μm) with indistinct boundaries, plagioclase up to 100 μm. Numerous oxide veins; abundant kamacite and troilite; chromite present.

Geochemistry: (C. Agee, N. Muttik, UNM) Olivine Fa19.2±0.2, Fe/Mn=40±2, n=7; low-Ca pyroxene Fs12.3±0.3Wo1.4±0.2, Fe/Mn=23±1, n=7; plagioclase An12.3±0.3Ab82.3±0.8Or5.4±0.8, n=4. Fs is slightly lower than the main correlation trend for Fa vs Fs for H chondrites, thus classified as H6-an (cf. Figures).

Classification: Ordinary chondrite (H6, W3, S3)

Specimens: 20.0 g including a probe mount on deposit at UNM, 22.8 g at PSFReed holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2009
Mass (g):423
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):19.2±0.2
Ferrosilite (mol%):12.3±0.3
Wollastonite (mol%):1.4±0.2
Classifier:C. Agee, UNM
Type spec mass (g):20.0 ; 22.8
Type spec location:UNM ; PSF
Main mass:B. Reed
Comments:Field name BR56; submitted by C. Agee
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 7552 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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