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| Northwest Africa 13302 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13302 This is an OFFICIAL meteorite name. Abbreviation: NWA 13302 Observed fall: No Year found: 2020 Country: Morocco Mass:  403 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 15 approved meteorites classified as Mesosiderite-A3. [show all] Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 31 May 2020 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Northwest Africa 13302 (NWA 13302) Morocco Purchased: 2020 Classification: Mesosiderite- A3 History: The 402.8 g sample was found in Morocco. Fabien Kuntz purchased the sample in Zagora, Morocco, in February 2020. Physical characteristics: Sample is irregular in shape and has a reddish-brown exterior with visible flakes of metal protruding through the surface. The cut face shows a metal-rich interior with angular clasts of pyroxene. Petrography: Sample is a breccia composed of: 0.5-10 mm clasts of normally zoned, anhedral orthopyroxene (Fs18-32Wo0.9-2.4) and 8 vol% unzoned, anhedral olivine (Fa34.72-37.49) set within a matrix of: 523 μm (avg. grain size) poikiloblastic, exsolved Opx (Fs34.5±1.4Wo2.4±0.23) (all pyx 47 vol%); 257 μm anhedral plagioclase (22 vol%), and 18 vol% cm-sized rounded nuggets and irregularly shaped intergrowths of FeNi metal. Matrix pyroxenes show lamellar to blebby exsolution. Olivine shows reaction coronas. Orthopyroxene makes up 63% of silicates and plagioclase makes up 31% of silicates. Additional minerals are: kamacite, taenite, lath-shaped Si polymorph (5 vol%), apatite, troilite, FeNi metal, chromite, trace ilmenite. Geochemistry: (A. Love, App) Olivine, Fa36.1±1.4 (Fa34.7-37.5), Fe/Mn=36.8-36.8, n=2); low-Ca pyroxene, Fs30.6±4.5Wo2.0±0.5 (Fs23.0-35.6Wo1.4-2.7,Fe/Mn=25.3±2.6, n=8); high-Ca pyroxene (Fs17.2Wo38.8, n=1); plagioclase (An93.0±1.0Or0.1±0.0, n=8). Classification: Mesosiderite (class A3) Sample is type A based on modal abundance of plagioclase and orthopyroxene. Sample is type 3 based on poikioblastic texture with interlocking grain boundaries and inverted, exsolved pyroxenes. Specimens: Fabien Kuntz holds the main mass. An endcut and part slice weighing 33.9 0g and a polished mount 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 Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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Geography:
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Statistics: This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||