![]() |
||
|
Northwest Africa 8675 | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 8675 This is an OFFICIAL meteorite name. Abbreviation: NWA 8675 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 272 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 12 Dec 2014 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 103:
Northwest Africa 8675 (NWA 8675) (Northwest Africa) Purchased: 2014 May Classification: HED achondrite (Eucrite, monomict) History: Purchased by John Higgins in May 2014 from a dealer in Laayoune, Morocco. Petrography: (A. Irving and S. Kuehner, UWS) Fresh monomict breccia composed of clasts of diabasic eucrite and related crystalline debris. Pyroxene has a clove-brown color in thin section, and shows unusual compositional zoning, with distinct cores of more magnesian low-Ca pyroxene mantled concentrically by much more ferroan low-Ca pyroxene. Grain boundary regions around pyroxene grains contain fayalitic olivine. Other minerals are subcalcic augite, calcic plagioclase, silica polymorph, Al-bearing chromite, ilmenite, troilite, Ni-free metal and rare, tiny grains of zircon. Geochemistry: Low-Ca pyroxene (cores Fs34.2-35.4Wo8.6-9.1, FeO/MnO = 30, N = 2; rims Fs62.5-66.3Wo7.0-3.4, FeO/MnO = 31-32, N = 2), fayalite (Fa84.6-85.2; FeO/MnO = 42, N = 2), subcalcic augite (Fs8.9-10.6Wo45.3-42.6; FeO/MnO = 30-33, N = 2). Classification: Eucrite (monomict, diabasic). Specimens: 23.2 g including one polished thin section at UWB. The remaining material is held by Mr. J. Higgins. | ||||||||||||||||||||||||||||||
Data from: MB103 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) UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012) |
||||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
| ||||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |