|
Northwest Africa 13474 | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 13474 This is an OFFICIAL meteorite name. Abbreviation: NWA 13474 Observed fall: No Year found: 2020 Country: Morocco Mass: 218 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 321 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Nov 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13474 (NWA 13474) Morocco Purchased: 2020 Mar Classification: Martian meteorite (Shergottite) History: Purportedly found in southern Morocco and purchased in Tindouf, Algeria in March 2020. David Lehman is the American agent for the owners. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained assemblage of predominantly twinned pyroxene (low-Ca pyroxene, pigeonite and subcalcic augite) and olivine (exhibiting very limited zoning, some grains enclosed in pyroxene) together with interstitial maskelynite (~15 vol.%, some with a curvilinear lath-like habit). Accessory phases include chromite (with variable Ti/Cr), ilmenite, merrillite, pyrrhotite, pentlandite and rare baddeleyite. Melt inclusions surrounded by subradial re-expansion cracks are common in olivine grains, and have rims of aluminous clinopyroxene enclosing assemblages of K-Na-rich feldspathic glass, plagioclase, chlorapatite needles, Fe-Ni sulfides and ilmenite. Geochemistry: Olivine (Fa43.0-45.6, FeO/MnO = 51-53, N = 6), low-Ca pyroxene (Fs24.6-25.6Wo3.5-6.4, FeO/MnO = 28-31, N = 5), pigeonite (Fs27.3-35.1Wo9.2-12.2, FeO/MnO = 27-31, N = 6), subcalcic augite (Fs17.4-20.3Wo35.1-35.5, FeO/MnO = 27, N = 3), maskelynite (An48.2-55.7Or1.7-2.6, N = 3). Classification: Shergottite (olivine gabbroic). Specimens: 20.3 g including one polished thin section at UWB; remainder with Mr. D. Lehman. | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
|
||||||||||||||||||||||||||||||
Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
||||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
| ||||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|