Angrites are a rare group of achondrites consisting mostly of Al-Ti bearing diopside, hedenbergite, olivine, anorthite and troilite with minor traces of phosphate and metals. The group is named for the Angra dos Reis meteorite. They are the oldest igneous rocks, with crystallization ages of around 4.56 billion years.

Sep 1, 2012 · Angrites are medium- to coarse-grained (up to 2–3 mm), unbrecciated and substantially unshocked igneous rocks of roughly basaltic composition.

Nov 11, 2021 · Angrites are igneous rocks characterized by subequal abundances of olivine, pyroxene and plagioclase. The compositions of the major mineral phases are unusual. Olivine is calcium-bearing, and frequently contains inclusions or exsolution lamellae of kirschteinite.

This is 1 of 43 approved meteorites classified as Angrite. Search for specimens in the Smithsonian Institution collection (U.S.): Search for this meteorite in the Natural History Museum collection (U.K.): Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)

Oct 18, 2022 · A petrographic thin section micrograph of an angrite primarily composed of augite, olivine, and plagioclase. Credit: Meteorite Times Magazine. Angrites are olivine-bearing, basaltic meteorites that originate from a volatile-depleted planetesimal.

May 15, 2023 · Angrites are defined as a group of unshocked, alkali-depleted basaltic meteorites that are amongst the oldest igneous rocks in the Solar System 1, 2.

Nov 27, 2023 · Here, we report on microstructurally guided in situ geochemical and Pb–Pb isotopic measurements on angrites aimed at better understanding of the timing and nature of magmatic processes, as well as impact events, on the APB.