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Basic information Name: Msied
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2021
Country: Morocco
Mass:help 1900 g
Meteoritical Bulletin:  MB 111  (2023)  H4-6
Recommended:  H4-6    [explanation]

This is 1 of 114 approved meteorites classified as H4-6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Nov 2022
Writeup from MB 111:

Msied        27.843°N, 10.613°W


Confirmed fall: 2021 Nov 16

Classification: Ordinary chondrite (H4-6)

History: (H. Chennaoui Aoudjehane, FSAC, ATTARIK Foundation, Morocco) On the evening of November 16, 2021, around 9:30 pm, a fireball was seen by many people in the area of Guelmim and Tan-Tan, Morocco. Field investigations were conducted in December by H. Chennaoui Aoudjehane, M. Aoudjehane, L. Zennouri (FSAC and ATTARIK), A. Bouferra and a team from the Moroccan Association of Meteorites to obtain the coordinates of the fall and testimonies of eyewitnesses. Only one explosion was heard and a white color was reported for the visible meteor. Eyewitnesses from Msied village said it was like a broken lightning in the evening lasting 2 or 3 ", moving from north to south and stopping by the mountains. The first stones were found on December 4 following rainfall in the province. Only a few pieces were found totaling less than 2 kg. The strewnfield is about one km long in concordance with a direction north to south reported by eyewitnesses.

Physical characteristics: Large complete pieces are rare. The main mass is 840 g followed by 560 g then 120 g, 104.6 g and many smaller pieces (the smallest around one gram). Many stones are fully covered by matte black fusion crust. Interiors of specimens are brecciated with light and dark gray regions. Broken stones show minor rusting because of the rainfall that occurred before the specimens were collected. Magnetic susceptibility log χ (× 10-9 m3/kg) = 5.23 (mean of 4 measurements).

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) This specimen is a breccia composed of equilibrated chondrite clasts of various petrologic types. Type 4 clasts consist of well-formed chondrules in a relatively coarse-grained matrix, whereas Type 5 clasts contain fewer well-formed chondrules, and Type 6 clasts are largely recrystallized with only a few relict chondrules and holly leaf-shaped metal grains. In between these lithic clasts is a sparse opaque, very fine grained matrix. Some of the metal in the studied thin section exhibits very slight staining by terrestrial Fe oxides.

Geochemistry: Olivine (Fa19.5±1.3, range Fa18.8-21.8, PMD = 4.9%, N = 5), low-Ca pyroxene (Fs16.7±0.1Wo0.9±0.3, range Fs16.5-16.8Wo0.6-1.2, N = 4), augite (Fs8.8Wo35.0; Fs5.8Wo48.3; N =-2).

Classification: Ordinary chondrite (H4-6 breccia).

Specimens: 45.3 g including one polished thin section and a polished endcut at UWB; 20.3 g at FSAC; three larger stones (840 g, 560 g, 120 g) and many small pieces totaling 1400 g with WangZ; two larger stones (104.6 g, 47.7 g) and many small pieces totaling 230 g in a private collection in Casablanca, Morocco.

Data from:
  Table 0
  Line 0:
Date:2021 Nov 16
Mass (g):1900
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):19.5±1.3
Ferrosilite (mol%):16.7±0.1
Wollastonite (mol%):0.9±0.3
Magnetic suscept.:5.23
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):65.6
Type spec location:UWB, FSAC
Main mass:WangZ
Comments:Work name WZY-73; submitted by A. Irving
   and collections
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 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)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Chunliang Zhang            
Fujun Ren   
Woreczko Jan & Wadi      
Ziyao Wang               

     Recommended::   (27° 50' 35"N, 10° 36' 47"W)

     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)
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