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Northwest Africa 637
Basic information Name: Northwest Africa 637
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 637
Observed fall: No
Year found: 2000
Country: (Northwest Africa)
Mass:help 82 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  H5
Recommended:  H5    [explanation]

This is 1 of 10803 approved meteorites (plus 19 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 17 Jun 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 637 (NWA 637)

(Northwest Africa)

Purchased: 2000

Classification: Ordinary chondrite (H5)

History: 1 stone weighing 82 g was found in Morocco in 2000. Thomas Webb acquired the sample from a Michael Cottingham in 2000.

Physical characteristics: The stone is brown and tabular in shape. A weathered, brown fusion crust covers approximately 40% of the exterior of the stone. The cut face of the interior of the stone is brown and displays small chondrules, chondrule fragments and fresh and weathered flakes of metal.

Petrography: Description and classification (A. Love, App): Sample displays recrystallized chondritic texture composed of numerous well-defined chondrules withan average diameter of 325 μm set in a recrystallized matrix.

Geochemistry: (A.Love, App) Olivine Fa17.9±0.3, N=10; Low Ca pyroxene Fs16.1±0.2Wo1.4±0.2, N=8

Classification: Ordinary chondrite (H5, S2, W2)

Specimens: Two slices weighing 16.8 g, and a polished thin section are currently on deposit at App.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2000
Mass (g):82
Pieces:1
Class:H5
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):17.9±0.3 (N=10)
Ferrosilite (mol%):16.1±0.2 (N=8)
Wollastonite (mol%):1.4±0.2
Classifier:A. Love, App
Type spec mass (g):16.8
Type spec location:App
Main mass:TWebb
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
TWebb: No contact information provided., United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8136 approved meteorites from (Northwest Africa) (plus 1942 unapproved names)

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