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Northwest Africa 13439 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13439 This is an OFFICIAL meteorite name. Abbreviation: NWA 13439 Observed fall: No Year found: 2018 Country: Morocco Mass: 660 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||
Comments: | Approved 2 Nov 2020 | ||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13439 (NWA 13439) Morocco Purchased: 2018 Classification: HED achondrite (Eucrite) History: Thierry Simard purchased the 660 g sample in Zagora, Morocco, in November 2018. Physical characteristics: Approximately 40% of the sample is covered in a dark brown, wind-ablated fusion crust. The remainder of the stone is light grey in color and crystalline. The cut face shows the interior of the sample is light grey and has a basaltic texture. Petrography: (A. Love, App) Sample is unbrecciated, ophitic textured and transected by thin shock veins and planar dislocations. Some pyroxene grains have been recrystallized into finer-grained mosaics and both pyroxenes and plagioclase show clouding from fine-grained opaques. Pyroxenes are exsolved and inverted. Additional minerals are: Si polymorph, troilite, ilmenite, chromite, rare apatite. clouding from fine-grained opaques. Pyroxenes are exsolved and inverted. Additional minerals are: Silica polymorph, troilite, ilmenite, chromite, rare apatite. Geochemistry: (A. Love, App) Low Ca pyroxene (Fs62.7±0.3Wo1.9±0.1, Fe/Mn=30.1±0.2, Mg#36.0±0.3, n=8); high Ca pyroxene (Fs27.2±0.5Wo44.1±0.4, Fe/Mn=30.0±0.4, n=8); plagioclase (An87.9±2.7Or0.5±0.3, n=6). Classification: HED achondrite (Eucrite) Based on textures, equilibrated compositions, Mg# and Fe/Mn ratios of pyroxenes, this sample is an equilibrated basaltic eucrite. Specimens: T. Simard holds the main mass. Several slices, a polished thin section and mount comprise the 20.02g type specimen that is on deposit at App. | ||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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