| MetSoc Home Publications Contacts |
|
||
|
||
| Northwest Africa 4040 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Northwest Africa 4040 This is an OFFICIAL meteorite name. Abbreviation: NWA 4040 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass:  226 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 819 approved meteorites (plus 1 unapproved name) classified as L3. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||
| Comments: | Approved 3 Feb 2006 | ||||||||||||||||||||
| Writeup |
Writeup from MB 90:
Northwest Africa 4040 Find: 2004 Ordinary chondrite (L3) History: A complete stone weighing 226.3 g was found by an anonymous finder in the western Sahara in Morocco. Petrography: (A. Greshake, MNB) The sample is a brecciated ordinary chondrite with centimeter-size dark and light inclusions. The dark inclusion is composed of small anhedral, mostly skeletal olivine displaying compositional zoning from an Mg-rich core to a more Fe-rich rim embedded into a mostly glassy groundmass containing small dendrites of olivine and pyroxene, with sulfide spherules also present. A light inclusion is a brecciated intergrowth of compositionally zoned olivine and low-Ca pyroxene. Si, Al-rich glass occurs in the interstitial areas of the rock and commonly contains sulfide spherules. The sample contains abundant chondrules with a chondrule/matrix ratio typical of L chondrites. The mean chondrule size is ~0.7 mm. The petrologic type is probably very low. Composition: Olivine (Fa0.4–29.5), pyroxene (Fs2.8–23.9). Classification: Ordinary chondrite (L3); S2, W2. Specimens: One 24.5 g type specimen and one polished thin section are on deposit at MNB. Stefan Ralew of Germany holds the main mass. | ||||||||||||||||||||
| Data from: MB90 Table 2 Line 259: |
|
||||||||||||||||||||
| Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address) |
||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||
| References: | Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
| ||||||||||||||||||||
| Photos: |
| ||||||||||||||||||||
| Geography: |
Statistics: This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) | ||||||||||||||||||||