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| Hassi el Madani 001 | |||||||||||||||||||||||||||||||||||||||
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| 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:  6.12 kg | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 396 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 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 201 approved meteorites from Adrar, Algeria (plus 1 unapproved name) This is 1 of 1358 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||||||||||
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| Revision history: |
This lists important revisions made to data for this record.
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