Angrite (Evolved)

Angrite (Evolved)

Evolved achondrite composed mainly of augite (Wo>50; “fassite”) with small quantities of olivine (Fa10-100), plagioclase (An100) and troilite. Angrites are named for the Angra dos Reis meteorite that fell in Rio de Janeiro, Brazil, in early 1869. They are basaltic rocks, often containing porous areas and many round vesicles (small cavities) with diameters up to 2.5 cm. Angrites are the most ancient igneous rocks known, with crystallization ages of around 4.55 Ga. They are thought to have formed on one of the earliest differentiated asteroids. By comparing the reflectance spectra of the angrites to that of several main belt asteroids, two potential parent bodies have been identified: 289 Nenetta and 3819 Robinson.

Content above used with permission from J. H. Wittke.

 

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