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| Northwest Africa 13683 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13683 This is an OFFICIAL meteorite name. Abbreviation: NWA 13683 Observed fall: No Year found: 2018 Country: Algeria Mass:  1959 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 30 approved meteorites classified as R3-6. [show all] Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3) | ||||||||||||||||||||||||||||||||
| Comments: | Approved 13 Feb 2021 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13683 (NWA 13683) Adrar, Algeria Find: 2018 Classification: Rumuruti chondrite (R3-6) History: Found between 2018-2019. Many meteorites weighing a total of 1959 grams were purchased by Adria_n Contreras Gómez from a Sahara seller in July 2020. Physical characteristics: Sample lacks fusion crust, is irregular-shaped and shows abundant chondrules surrounded by sulfides. Petrography: Description and classification (A. Love, App) Sample is a genomict chondrite breccia composed of rounded to angular clasts of unequilibrated and recrystallized textures occurring within a host of slightly flattened, dispersed chondrules, fragments and sulfide grains. Recrystallized clasts lack discernible chondrules and low Ca pyroxene, and contains a network of 50µm secondary plagioclase. Chondrules average apparent diameter 424µm (n=105). Additional minerals are: troilite, abundant pentlandite, phosphate and chromite. Geochemistry: Host: olivine (Fa32.2±14.3, CV%=43 (R3.5), Fe/Mn=80.7±23.0, n=30); low Ca pyroxene (Fs6.6±6.0Wo1.0±0.8, Fe/Mn=19.7±11.6, n=7); pigeonite (Fs21.4±2.9Wo9.5±2.7, n=3); unequilibrated clast: olivine (Fa20.1±14.4, CV%=72 (R3.2), Fe/Mn=62.6±30.6, n=12); recrystallized clast: olivine (Fa37.6±0.1, Fe/Mn=73.1±3.6, n=6); high Ca pyroxene (Fs13.4±0.1Wo39.1±0.4, Fe/Mn=36.8±2.2, n=3). Classification: Rumuruti chondrite (R3-6, C-S2, wi-2) Chondrule diameter, magnetic susceptibility, ubiquitous pentlandite and lack of FeNi metal suggest sample is an R chondrite. Based on unequilibrated compositions and coefficient of variation w/in clast and host, sample is an R3.2-6. Specimens: Adrián Contreras holds the 290 g main mass. An endcut and several small fragments weighing 28.06 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||||
| Data from: MB110 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. 110, in preparation (2021)
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Geography:
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Statistics: This is 1 of 177 approved meteorites from Adrar, Algeria (plus 1 unapproved name) This is 1 of 1208 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||||