![]() |
||
|
Northwest Africa 4945 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 4945 This is an OFFICIAL meteorite name. Abbreviation: NWA 4945 Observed fall: No Year found: 2007 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 133 approved meteorites classified as EL6. [show all] Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 16 Sep 2011 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 100:
Northwest Africa 4945 (NWA 4945) (Northwest Africa) Purchased: 2007 March Classification: Enstatite chondrite (EL6) History: Purchased from a dealer in Agadir, Morocco, by Jack Schrader in March 2007 Physical characteristics: An unweathered stone weighing 3150 g coated with dark brown, satiny fusion crust Petrography: (A. Irving and S. Kuehner, UWS): Fine grained aggregate of predominantly enstatite (74 vol%), kamacite (8 vol%) and Cr-bearing troilite (8 vol.%), with accessory diopside, oldhamite, alabandite and tabular graphite plates. Daubreelite and schreibersite are absent. Sparse relict, partial RP chondrules and recrystallized chondrules. Geochemistry: Orthopyroxene (Fs0.1-0.3Wo1.5-1.4), clinopyroxene (Fs0.2-0.9Wo45.9), kamacite (7.2 wt.% Ni, 1.0 wt.% Si, 0.5 wt.% Co), troilite (0.3 wt.% Ti, 2.6 wt.% Cr, 0.8 wt.% Mn), alabandite (1.0 wt.% Cr, 26.7 wt.% Fe, 21.6 wt.% Mn, 7.5 wt.% Mg, 1.3 wt.% Ca) Classification: Enstatite chondrite (EL6, S1, W0). Paired with Northwest Africa 4946. Specimens: A total of 20.3 g of type material and one polished thin section are on deposit at UWS; a further 20 g of the same stone and one polished thin section are on deposit at BathO. The main mass is held by MFarmer. | ||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 1205: |
|
||||||||||||||||||||||||||||
Institutions and collections |
BathO: Bathurst Observatory Research Facility, 624 Limekilns Road, Kelso NSW 2795, Australia (institutional address; updated 27 Jul 2012) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
| ||||||||||||||||||||||||||||
Photos: |
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |