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Northwest Africa 4587
Basic information Name: Northwest Africa 4587
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4587
Observed fall: No
Year found: 2006
Country: Algeria
Mass:help 530 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 74 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4587

Algeria

Find: September 2006

Achondrite (ungrouped)

History: G. Hupé purchased the rock in September 2006 in Erfoud, Morocco.

Physical characteristics: The meteorite comprises a single, dense stone (530 g) without fusion crust. The main constituent (pyroxene) is a distinctive deep brown color and several large opaque grains are visible.

Petrography: (A. Irving and S. Kuehner, UWS) Granular texture with large pyroxene grains (pigeonite with numerous fine, parallel exsolution lamellae of clinopyroxene) and interstitial polycrystalline plagioclase (with rims of silica against pyroxene). Accessory minerals are skeletal ilmenite, merrillite, Ni-bearing pyrrhotite and rare kamacite. One large oikocryst of ilmenite + Ti-chromite contains numerous chadacrysts of plagioclase, and has narrow rims of fayalitic olivine adjacent to surrounding pyroxene.

Mineral compositions: Pyroxene consists of host pigeonite (Fs63.4Wo6.9 FeO/MnO = 67.6, TiO2 = 0.49 wt%) and lamellae of clinopyroxene (Fs35.4Wo38.9, FeO/MnO = 69.4, TiO2 = 0.90 wt%); plagioclase (An85); olivine rim adjacent to ilmenite (Fa81.9, FeO/MnO = 112).

Classification: Achondrite (ungrouped). This very fresh stone is essentially identical to NWA 011, NWA 2400 and NWA 2976, and evidently is paired with them.

Specimens: A total of 20 g of sample is on deposit at UWS. GHupé holds the main mass.

Data from:
  MB92
  Table 2
  Line 110:
Place of purchase:Erfoud, Morocco
Date:July-2006
Mass (g):530
Pieces:1
Class:Ach-ung
Type spec mass (g):20
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
abibou   
Anthony James   
bphd   
Chris Handler   
Noel Darlucio Pura   
Solar Anamnesis   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 728 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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