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Northwest Africa 7873
Basic information Name: Northwest Africa 7873
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7873
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 446 g
Meteoritical Bulletin:  MB 102  (2013)  H5-6
Recommended:  H5-6    [explanation]

This is 1 of 156 approved meteorites classified as H5-6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 9 May 2013
Writeup from MB 102:

Northwest Africa 7873 (NWA 7873)

(Northwest Africa)

Purchased: Sept 2009

Classification: Ordinary chondrite (H5-6)

History: A single stone was purchased from Moroccan dealers by Ronnie McKenzie. Fred Olsen donated two large slices to Cascadia on June 30, 2010.

Physical characteristics: A fresh stone with no sign of oxidation; regmaglypts are present on 3 fusion crusted sides.

Petrography: (K. Armstrong and A. Ruzicka, Cascadia) The specimen has light-colored clasts with relatively indistinct chondrules, and a darker host that contains more distinct chondrules (mean diameter = 0.7 ± 0.4 mm) and a matrix that is opaque to translucent in transmitted light. Both portions are variably blackened by containing many small opaque minerals in short veins and melt pockets. The host contains a large (up to ~0.9 cm across) metal-poor igneous-textured inclusion with turbid glassy mesostasis, adjacent to a large (~0.7 cm across) composite metal-sulfide grain. Metal and troilite contents determined by point counting of reflected light images are 7±1 and 1.9±0.1 area%, respectively.

Geochemistry: Olivine in both light-colored clast and darker host portions is relatively equilibrated (Fa18.5±0.4, Fe/Mn = 37.6±4.9, N=35); low-Ca pyroxene in the host is also equilibrated (Wo1.1±0.2 Fs16.7±1.0, Fe/Mn=23.2±3.2, N=12).

Classification: A shock-blackened genomict breccia with H5 host and H6 clasts.

Specimens: 44.3 g in two slices, two polished thin sections, and a polished mount are on deposit at Cascadia. Ronnie McKenzie holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, Colorado
Date:P Sept 2009
Mass (g):446
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):18.5±0.4
Ferrosilite (mol%):16.7±1.0
Wollastonite (mol%):1.1±0.2
Classifier:K. Armstrong and A. Ruzicka, Cascadia
Type spec mass (g):44.3
Type spec location:Cascadia
Main mass:Ronnie McKenzie
Comments:Field Number RM4 and Lab Sample CML0615; submitted by A. Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9806 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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