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Northwest Africa 7442
Basic information Name: Northwest Africa 7442
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7442
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 295 g
Meteoritical Bulletin:  MB 102  (2013)  H4
Recommended:  H4    [explanation]

This is 1 of 6389 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Sep 2013
Revised 19 Nov 2013: fixed typos in min comps
Writeup from MB 102:

Northwest Africa 7442 (NWA 7442)

Northwest Africa

Purchased: 2004

Classification: Ordinary chondrite (H4)

Physical characteristics: The samples are generally rusty looking. Most of the fusion crust has been weathered away, but approximately 20% of fusion crust, appearing dark brown, remains and scatters around the surface with thickness less than 1 mm.

Petrography: (K. Guo, ROM): Chondrules and chondrule fragments make up 80% of the thin section. Metals and sulfides make up about 10% of the thin section. Troilite and silicate inclusions in metals are common. Matrix is fairly fine grained. Glass appearing bright red in transmitted light is present both in the matrix and shock veins. Shock veins are pervasive. The majority of olivine show undulose extinction. Approximately 50% of metal and sulfides are oxidized.

Geochemistry: Olivine Fa18.8±3.9 (N=22), PMD FeO olivine= 12.3; two olivine points deviate from others by about 10 wt% in Fo content. If excluded. Fa17.7±1.5 (N=20), PMD FeO olivine= 3.8; low-Ca pyroxene Fs17.0±1.6, Fs17En81Wo1 (N=35), high-Ca pyroxene Fs=13.4±11.3, Fs13En56Wo31(N=4).

Classification: Ordinary chondrite H4; W2; S3.

Specimens: Specimen: A total of 295.48 g is on deposit at ROM

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2004
Mass (g):295.48
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):18.8±3.9 (N=22)
Ferrosilite (mol%):17.1±1.6 (N=35); 13.4±11.3 (N=4)
Wollastonite (mol%):1.4±1.4 (N=35); 31.1±16.9 (N=4)
Classifier:K. Guo, ROM
Type spec mass (g):295.48
Type spec location:ROM
Main mass:ROM
Comments:Submitted by Brendt Hyde
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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