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Northwest Africa 13370 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13370 This is an OFFICIAL meteorite name. Abbreviation: NWA 13370 Observed fall: No Year found: 2020 Country: Morocco Mass: 312 g | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 459 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||||
Comments: | Approved 2 Aug 2020 | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13370 (NWA 13370) Morocco Purchased: 2020 Classification: HED achondrite (Howardite) History: In February of 2020, Fabien Kuntz purchased two stones with a total weight of 311.8 g from a meteorite prospector in Guelmim, Morocco. Physical characteristics: A sample from each stone was submitted for classification. Both stones have a dark-brown, wind-ablated exterior. Clasts are visible on the exterior. The cut face shows sample is a breccia with visible orthopyroxene clasts, lithic clasts up to 2 mm and flecks of Fe metal. Petrography: Description and Classification (A. Love, App) Sample is composed of (vol %): angular to rounded lithic clasts of eucrite (70) and diogenite (30) and similar mineral fragments set within a comminuted matrix of these materials. Lithic clasts are: cumulate and equilibrated basaltic eucrite; diogenite (including a poikilitic diogenite) and a highly magnesian olivine-orthopyroxene lithology (Fa5-Fs13Wo0.3); and several shock-melted clasts (melt breccia - total melt). Eucritic pyroxenes are exsolved. Additional minerals are olivine chromite, ilmenite, troilite, plagioclase, Fe metal grains and a silica polymorph. Geochemistry: (A. Love, App) Diogenite: orthopyroxene (Fs26.0±5.1Wo1.7±1.1, Fe/Mn=32.2±4.1, n=12); Olivine, Fa25.2±14.8 (Fa5.6-47.7, Fe/Mn=40.6±6.8, n=9). Eucrite: low-Ca pyroxene (Fs52.7±10.0Wo3.2±1.2, Fe/Mn=29.4±1.4, n=5); pigeonite (Fs42.7-49.7Wo8.9-12.1, N=2); high-Ca pyroxene (27.5±7.0Wo40.8±2.2, n=5); plagioclase (An93.1±2.4Or0.2±0.1, n=6). Classification: HED achondrite (howardite). Based on texture, modal abundances, unequilibrated mineral compositions, Fe/Mn and Mg# of orthopyroxenes and olivines, this sample is a howardite with a shock stage corresponding to M-S2 and low weathering grade. Specimens: Kuntz holds the main masses. Two slices weighing 29.78 g and a polished thin section are 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) Kuntz: Fabien Kuntz, France; Website (private address) |
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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 2049 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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