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Northwest Africa 584
Basic information Name: Northwest Africa 584
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 584
Observed fall: No
Year found: 2000
Country: (Northwest Africa)
Mass:help 187 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  H3-5
Recommended:  H3-5    [explanation]

This is 1 of 78 approved meteorites classified as H3-5.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 24 Aug 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 584 (NWA 584)

(Northwest Africa)

Purchased: 2000

Classification: Ordinary chondrite (H3-5)

History: One stone weighing 187 g was found in Morocco in 2000. Thomas Webb acquired the sample from a Michael Cottingham in 2000.

Physical characteristics: The oriented stone is brown and ovoid in shape. A weathered, dark brown fusion crust covers approximately 35% 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 is composed of well-defined chondrules, chondrule fragments, mineral clasts metallic grains and sulfides set within a recrystallized matrix. CL and SEM petrography indicate sample is a mixture chondrules and fragments. Chondrules contain turbid to devitrified mesostases and have an average diameter of 392 μm.

Geochemistry: (A.Love, App) Unequilibrated regions: Olivine Fa14.2±6.6 (Fa0.8-26.2 N=23); Low Ca pyroxene Fs12.3±5.2 (Fs2.9-18.6 N=12)

Specimens: 25.9 g and 1 polished thin section are on deposit at App.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2000
Mass (g):187
Pieces:1
Class:H3-5
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):14.2±6.6 (N=23)
Ferrosilite (mol%):12.3±5.2 (N=12)
Wollastonite (mol%):1.6±1.1
Classifier:A. Love, App
Type spec mass (g):25.91
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:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7320 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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