2025年3月17日 · Northwest Africa 2828: reclassification Rubin (2016) reclassified Al Haggounia 001 and paired specimens as "vesicular, incompletely melted, EL chondrite impact melt rock[s]." NWA 2828 is likely paired, and is therefore also reclassified.

2016年7月20日 · The massive Al Haggounia 001/NWA 2736/NWA 2828/NWA 7401 EL chondrite suffered a high-energy collision on its parent asteroid, producing numerous shock effects (1) shock deformation of silicate grains and the development in them of strong undulose extinction and weak mosaicism; (2) dispersion of metal-sulfide blebs along fractures within the ...

Petrographic Features: NWA 2828 contains obvious but sparse RP enstatite chondrules, some of which contain K-bearing glass. The matrix is not recrystallized, but consists mostly of enstatite (Fs0.2Wo1.2) blades, sodic plagioclase and stained voids (former primary kamacite grains) with accessory alabandite and other phases[1].

Aubrite NWA 2828: Pale gray microbreccia composed mainly of twinned enstatite with subordinate plagioclase (An13.5-15.3Or3-4) and altered troilite (with daubreelite blades). Rare Mn-alabandite, daubreelite, oldhamite, Ti-free troilite, and very rare kamacite specks are …

2006年9月1日 · TEM data of NWA 5958 matrix confirm that it has experienced aqueous alteration and support the suggestion of Jacquet et al. (34) that this meteorite has affinities to CM2 chondrites. Read more ...

The well-formed, round chondrules containing glass coupled with the unrecrystallized matrix lead us to re-classify NWA 2828 as an EL3 chondrite. We also must revise our opinion [1] about the relationship between NWA 2828 and material classified as EL chondrites NWA 2965 and NWA 2736, which evidently come from the more extensively weathered top ...

Al Haggounia 001 and paired specimens (including Northwest Africa [NWA] 2828 and 7401) are part of a vesicular, incompletely melted, EL chondrite impact melt rock with a mass of ~3 metric tons.

The Enstatite-rich Al Haggounia 001 meteorite was found in 2006. Some material from the same meteorite has also been reported under the name of Northwest Africa 2828 (NWA 2828). Approximately 3 tons are reported to have been found strewn over 40-50 kilometers including both Morocco and Western Sahara.

The dominant primary phase in NWA 2828 is essentially pure enstatite, which forms stubby prismatic grains. New information on the find site in Algeria indicates that the NWA 2828 material was excavated from a subsurface deposit, and terrestrial rhyolite pebbles and sandy matrix are attached to several NWA 2828 stones (image 1).

Haggounia 001/NWA 2736/NWA 2828/NWA 7401 EL chondrite suffered a high-energy collision on its parent asteroid, producing numerous shock effects: (1) shock deformation of silicate grains and the develop-ment in them of strong undulose and weak mosaic extinction, (2) dispersion of metal-sulfide blebs along