Exotic armalcolite and the origin of Apollo 11 ilmenite basalts

Abstract

Armalcolite is probably partly exotic in lunar basalt 10022 as suggested by K 2O,SiO 2-rich devitrified glass included within it. Assimilation of armalcolite (and possibly ilmenite) and addition of a K 2O,SiO 2 rich liquid probably helped produce the high TiO 2 content and variable alkali contents of Apollo 11 ilmenite basalts