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Northwest Africa 4536
Basic information Name: Northwest Africa 4536
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4536
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 283 g
Meteoritical Bulletin:  MB 94  (2008)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 501 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 8 Sep 2008
Writeup from MB 94:

Northwest Africa 4536

Northwest Africa

Find: December 2006

Achondrite (eucrite)

History: Purchased in Erfoud (Morocco) in December 2006.

Physical characteristics: One piece with nearly complete (90%) shiny dark, cracked fusion crust and deep, well-formed regmaglypts. Interior is light greenish-yellow in color. Sawn section displays two lithologies: one fine-grained with millimeter length laths, dark needles (plagioclase and pyroxene) and white spots, the other is gray and brecciated with dominant pyroxene. Total weight, 283.1 g.

Petrography: (A. Jambon, O. Boudouma and D. Badia, UPVI) Fine-grained lithology dominated by equant grains of plagioclase and pigeonite. Accessories phases are ilmenite, augite, silica, and troilite. Plagioclase and pigeonite form equant sub-hexagonal crystals of about 5–20 μm. Mode (vol%): Plagioclase 44, pigeonite 27, augite 16, silica 10, ilmenite and troilite 1, fractures and voids 3. The coarse-grained lithology is dominated by shocked basaltic eucrite with grains of 0.2 to 1 mm. Laths of plagioclase interstitial to pyroxene.

Mineralogy: (EMPA and SEM). Plagioclase An89; pigeonite En35Fs63Wo2, FeO/MnO = 33, Mg# = 0.36; augite En30Fs30Wo40, FeO/MnO = 34, Mg# = 0.50.

Classification: Basaltic, dimict eucrite; fresh sample, no weathering is observed.

Type specimens: A total of 20 g and one polished section are on deposit at UPVI. P. Thomas at Meteoritica (France) holds the main mass.

Data from:
  Table 2
  Line 34:
Mass (g):283.1
Ferrosilite (mol%):63,30
Wollastonite (mol%):2,40
Classifier:A. Jambon, O. Boudouma and D. Badia, UPVI
Type spec mass (g):20
Type spec location:UPVI
Main mass:PThomas
   and collections
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
PThomas: Philippe Thomas, Meteoritica, La Chave, 07690 St André en Vivarais, France (private address)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 1625 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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