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Northwest Africa 628
Basic information Name: Northwest Africa 628
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 628
Observed fall: No
Year found: 2000
Country: (Northwest Africa)
Mass:help 176.6 g
Meteoritical Bulletin:  MB 104  (2015)  H6
Recommended:  H6    [explanation]

This is 1 of 6354 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 5 Dec 2015
Writeup from MB 104:

Northwest Africa 628 (NWA 628)

(Northwest Africa)

Find: 2000

Classification: Ordinary chondrite (H6)

History: 1 stone weighing 176.6 g was found in Morocco and sold to Michael Cottingham. Thomas Webb acquired the sample in November of 2000.

Physical characteristics: The oriented stone is brown and flattened in shape. A weathered, dark-brown fusion crust covers approximately 35% of the exterior of the stone and displays a continuous rollover lip around the trailing edge. 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 with a few remaining relict chondrules. Relict chondrules have an avg. diameter of 607 μm. Porphyritic chondrules have completely recrystallized mesostasis regions.

Geochemistry: (A. Love, App): Olivine Fa19.2±0.2, N=6; Low Ca pyroxene Fs17.1±0.2Wo1.9±0.2, N=9

Classification: Based on olivine and pyroxene compositions and texture, this is an ordinary chondrite (H6, S3, W2).

Specimens: A polished thin section, an endcut, several slices and small fragments weighing 22.3 g are currently on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Mass (g):176.6
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):19.3±0.2 (N=6)
Ferrosilite (mol%):17.1±0.2 (N=9)
Wollastonite (mol%):1.9±0.2
Classifier:A. Love, App
Type spec mass (g):22.34
Type spec location:App
Main mass:TWebb
Comments:Submitted by Anthony Love
   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)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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