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Hassi el Madani 001
Basic information Name: Hassi el Madani 001
     This is an OFFICIAL meteorite name.
Abbreviation: HeM 001
Observed fall: No, but it is possible
Year found: 2019
Country: Algeria
Mass:help 6.12 kg
Classification
  history:
Recommended:  LL4    [explanation]

This is 1 of 370 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Hassi el Madani 001 (HeM 001)        28.772° N, 01.539° W

Adrar, Algeria

Find, possible fall: 2019 Aug 01

Classification: Ordinary chondrite (LL4)

History: On August 1, 2019, observers in the vicinity of Adrar, Algeria, witnessed a bright fireball event. After searching in the desert for several days, crusted and broken stones were found by an anonymous hunter on August 7 in the region north of Adrar and close to a named well (Hassi el Madani). Subsequently in early October 2019, Naji Ben Faraji purchased the stones from the finder in Tindouf, Algeria.

Physical characteristics: Many of the broken stones (total weight 6115 g) are partially coated in fresh black fusion crust and the light gray interiors contain visible, slightly stained but mostly very fresh metal.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen composed of fairly closely packed, relatively large, equilibrated PO, BO and RP chondrules set in a finer grained, partly recrystallized matrix containing taenite, stained kamacite, troilite, chromite, merrillite and chlorapatite. PO chondrules consist of euhedral olivine and pyroxene grains within a groundmass of glassy microcrystalline material containing albitic plagioclase. Calcic plagioclase was observed in one BO chondrule. A metal-rich nugget (0.4 mm across) in the studied thin section is composed of taenite, stained kamacite and troilite.

Geochemistry: Olivine (Fa27.0±0.2, range Fa26.8-27.2, N = 9), low-Ca pyroxene (Fs21.5±0.8Wo2.2±1.6, range Fs20.2-22.2Wo0.4-4.4, N = 5), pigeonite (Fs19.0Wo9.2; Fs17.1Wo17.4; N = 2), augite (Fs7.6Wo45.9), plagioclase in BO chondrule (An80.4Ab19.4Or0.3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.58. Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 4.299, 4.234, 4.335, 4.104; δ18O 5,799, 5.197, 5.841, 5.425; Δ17O 1.237, 1.490, 1.251, 1.240 per mil (all data linearized).

Classification: Ordinary chondrite (LL4).

Specimens: 24.1 g including one polished thin section at UWB; remainder with Mr. N. Ben Faraji.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Adrar
Place of purchase:Tindouf, Algeria
Date:2019 Aug 01
Latitude:28.772° N
Longitude:01.539° W
Mass (g):6115
Pieces:many
Class:LL4
Shock stage:S2
Weathering grade:W0/1
Fayalite (mol%):27.0±0.2
Ferrosilite (mol%):21.5±0.8
Wollastonite (mol%):2.2±1.6
Magnetic suscept.:4.58
Classifier:A. Irving & P. Carpenter
Type spec mass (g):24.1
Type spec location:UWB
Main mass:N. Ben Faraji
Comments:Work name NBF MN40; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
N. Ben Faraji            
Geography:

Algeria
Coordinates:
     Recommended::   (28° 46' 19"N, 1° 32' 20"W)

Statistics:
     This is 1 of 148 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1034 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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