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| Northwest Africa 4536 | |||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 4536 This is an OFFICIAL meteorite name. Abbreviation: NWA 4536 Observed fall: No Year found: 2006 Country: Morocco Mass:  283 g | ||||||||||||||||||||||
| Classification history: |
This is 1 of 576 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 |
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: MB94 Table 2 Line 34: |
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| Institutions 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography:
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Statistics: This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||