| MetSoc Home Publications Contacts |
|
||
|
||
| Northwest Africa 4722 | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Northwest Africa 4722 This is an OFFICIAL meteorite name. Abbreviation: NWA 4722 Observed fall: No Year found: 2006 Country: Morocco Mass:  294 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 507 approved meteorites classified as LL3. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||
| Comments: | Approved 8 Sep 2008 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 94:
Northwest Africa 4722 Morocco Find: January 2006 Ordinary chondrite (LL3) History: Stones were purchased in Erfoud by C. Giessler in January 2006. Physical characteristics: 48 small, crusted stones with brownish interiors, totaling 294 g. Petrography: (M. Bourot-Denise, MNHNP) The meteorite displays a homogeneous texture with mm-sized chondrules. BSE images point to an unequilibrated chondrite, with large type II FeO-rich chondrules, and small (<500 μm in size) type I, FeO-poor chondrules. In the type I chondrules, olivines are sometimes zoned. Rare metal and sulfide occur in large nodules (100–200 μm). Terrestrial alteration has significantly affected the matrix and the opaque minerals in the matrix. Geochemistry: Olivine, Fa13.5 ± 11.1, range Fa0.8–36.5, CaO up to 0.18, Cr2O3 = 0.15 (both wt%); low-Ca pyroxene, Fs10.3 ± 9.5, range Fs1.1–27.7. Magnetic susceptibility: (J. Gattacceca, CEREGE) logχ = 3.23 (10-9 m3/kg) is consistent with a weathered LL chondrite. Classification: Ordinary chondrite (LL3, estimated subtype 3.4); weathering grade W3; shock stage S1. Type specimens: A total of 24.3 g of sample (4 sawn fragments) and one polished mount are on deposit at MNHNP. C. Giessler holds the main mass. | ||||||||||||||||||||||||||
| Data from: MB94 Table 2 Line 54: |
|
||||||||||||||||||||||||||
| Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 10 Jun 2023) MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) |
||||||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||||||
| References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
| ||||||||||||||||||||||||||
| Photos: |
| ||||||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||