The chemical composition and structure of the moon.

It is assumed that most of the igneous rocks on the lunar surface are the product of partial melting in the lunar interior, followed by segregation and upward transport of an igneous liquid. An attempt is made to determine constraints on the composition of the lunar interior that derive from the chemical composition of the lunar igneous rocks. The salient chemical characteristics of igneous rocks from the lunar surface are summarized, and are compared to analogous characteristics of terrestrial volcanic rocks so that major similarities and differences between terrestrial and lunar basaltic rocks can be established.