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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 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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