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howardite : ウィキペディア英語版
howardite

Howardites are achondritic stony meteorites that originate from the surface of the asteroid 4 Vesta, and as such are part of the HED meteorite clan.〔Harry Y. McSween, ''Meteorites and their parent planets''. Cambridge University Press, 1999. ISBN 0-521-58751-4, ISBN 978-0-521-58751-8. - (p.129 )〕〔(Howardite ) - daviddarling.info〕 There are about 200 distinct members known.〔(Meteoritical Bulletin Database: Howardites )〕
==Characteristics==
They are a regolith breccia consisting mostly of eucrite and diogenite fragments, although carbonaceous chondrules and impact melt can also occur. The rock formed from impact ejecta which was later buried by newer impacts and lithified due to the pressure from overlying layers. Regolith breccias are not found on Earth due to a lack of regolith on bodies which have an atmosphere.

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