Achondrite: A stony meteorite
that lacks chondrules and originated on a differentiated parent body.
Diogenite: Diogenites
are an abundant type of achondrite, linked by geochemical traits such
as oxygen isotopic ratios and certain elemental ratios, of which Fe/Mn
is the most widely cited. The dominant mineral in diogenites is orthopyroxene.
The diogenites are strongly linked with two other achondrite groups:
eucrites and howardites; the three groups are collectively known as
HED meteorites and may come from asteroid 4 Vesta.
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