Diogenites

Diogenites are calcium-poor basaltic achondrites, consisting almost entirely of the Mg-rich pyroxene, hypersthene. They contain only minor mounts of plagioclase and olivine. The mineralogy and oxidation state of diogenites are close enough to those of eucrites to suggest a common parent body. Because diogenites have a coarse-grained texture with large interlocking crystals, however, they must have cooled more slowly than the eucrites. Diogenites probably crystallized from a magma at some depth:. They are plutonic rocks (as opposed to volcanic ones).

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