Achondrites angrites

Differentiated (planetary) Achondrites Angrites Aubrites Brachinites HED meteorites Eucrites Howardites Diogenites Ureilites Stony-irons Pallasites... 

Differentiated, or evolved, achondrite types are rare. Other than the HED group, there are only two other known asteroidal sources, one for the angrites (six known meteorites) (Mittlefehldt et al., 2002) and one for the unique basalt NWA Oil (Yamaguchi et al., 2002). Oxygen isotopic... 

The angrites are basaltic in composition, and critically silica undersaturated—all have normative olivine, Ca2Si04, and nepheline and lack orthopyroxene (Mittlefehldt et al., 2002). Angrites are also characterized by extreme depletions in moderately volatile elements (Figure 1). They have very low abundances of all the alkali elements, and have Ga/Al ratios lower than for any other achondrite, lunar sample, or martian meteorite... 

Weigel A., Eugster O., Koeberl C., and Krahenbuhl U. (1997) Differentiated achondrites Asuka 881371, an angrite, and Divnoe noble gases, ages, chemical composition, and relation to other meteorites. Geochim. Cosmochim. Acta 61, 239-248. 

Other groups angrites. lunar regions (highlands) not sampled by Apollo missions Rare achondrite groups... 

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