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Boutel Fil
Basic information Name: Boutel Fil
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2023
Country: Chad
Mass:help 33.5 kg
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2930 approved meteorites (plus 2 unapproved names) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 7 Oct 2023
Writeuphelp
Writeup from MB 112:

Boutel Fil        12°34’58.2’’N, 14°56’45.6’’E

Chari-Baguirmi, Chad

Confirmed fall: 2023 July 8

Classification: Ordinary chondrite (LL6)

History: On the night of 8 July 2023, a meteorite shower occurred on flat, cultivated land, in fields and among small settlements north of the town of Boutel Fil. Three sonic booms were heard. People found black stones on the ground the following morning and started to collect them. The event triggered media coverage in Chad, leading to private initiatives to recover stones from the villagers. Marcin Cimala (Poland) sent a 33 g sample to Ansgar Greshake (MNB) for classification. Jean-Claude Doumnang, professor of Geology at the University of N’Djamena and responsible for the declaration of the previous fall from Chad, Andila (2014), heard about the event while in France working with P. Rochette (CEREGE). Upon return to N’Djamena in early August he visited the Ministry of Mines, which had sent geologists to inquire about the event on July 23. They were shown the site where a large stone had excavated a shallow cavity in soil about 0.5 m in diameter. This site is the one for which coordinates are reported. They were able to observe 6 fully crusted fresh stones from 44 to 316 g. They also made pXRF analysis of one stone, confirming the chondritic composition (abundance of Mg and Fe, presence of Ni). In N’Djamena Jean-Claude Doumnang and his contacts met a number of people who own pieces of the meteorite, and secured two samples, for N’djamena University and for CEREGE.

Physical characteristics: Many individual rocks, most of which are partly to completely covered with pale black fusion crust. Broken surfaces display a fresh light-grayish interior.

Petrography: (A. Greshake, MNB) The meteorite is an ordinary chondrite showing a thoroughly recrystallized texture with few poorly delineated relict chondrules. Main minerals are olivine, low-Ca pyroxene, and sodic plagioclase (grain size about 70 µm). More minor phases include Ca-pyroxene, Cl-apatite, troilite, and rare FeNi metal. Few black melt clasts are present.

Geochemistry: olivine: Fa27.9±0.2 (Fa27.6-28.3, FeO/MnO=54±2, n=7); low-Ca pyroxene: Fs22.0±0.3Wo1.7±0.2 (Fs21.7-22.5Wo0.9-1.0, FeO/MnO=31±2, n=7); Ca-pyroxene: Fs8.8±0.4Wo43.0±2.3 (Fs8.6-9.7Wo37.3-44.1, FeO/MnO=22±2, n=7); feldspar: An10.2-10.7Ab83.4-85.2Or4.3-6.0, n=7. Magnetic susceptibility, measured with SM30 instrument is log χ (× 10-9 m3/kg)=3.99.

Specimens: 33.5 g including one polished thin section are at MNB. 20.5 g including one polished thin section are at UWB under work name WZY-183. About 80 g are at CEREGE and about 30 g at the University of N’Djamena. Polandmet - Marcin Cimala holds 16 kg, WangZ purchased a total of 9.5 kg including one large 3.5 kg stone, Miguel Angel Contreras Gomez holds 7 kg, and Viktor Ivanov holds 670 g. Remainder held by anonymous finders.

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Chari-Baguirmi
Date:2023 July 8
Latitude:12°34'58.2''N
Longitude:14°56'45.6''E
Mass (g):>33500
Pieces:many
Class:LL6
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):27.9
Ferrosilite (mol%):22.0
Wollastonite (mol%):1.7
Magnetic suscept.:3.99
Classifier:A. Greshake, MNB
Type spec mass (g):134
Type spec location:MNB/UWB/CEREGE
Main mass:anonymous
Finder:Numerous local villagers
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Polandmet: targoniny 30 43445 Dziegielow Poland, Poland; Website (institutional address; updated 7 May 2021)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Fujun Ren         
Guchen Chen   
Woreczko Jan & Wadi            
Ziyao Wang                     
Geography:

Chad
Coordinates:
     Recommended::   (12° 34' 58"N, 14° 56' 46"E)

Statistics:
     This is 1 of 4 approved meteorites from Chari-Baguirmi, Chad
     This is 1 of 8 approved meteorites from Chad (plus 2 impact craters)
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Synonymshelp: Boutel Fil (a) (assigned on discovery of (b))

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