As such, the Lunar Magma Ocean is initially expected to solidify from the bottom up. After about 80% of the Lunar Magma Ocean has crystallized, the mineral plagioclase crystallizes along with other minerals. Rocks that are primarily made of plagioclase (i.e., anorthosite) form and float towards the surface of the Moon making the primordial crust of the Moon.
As such, the Lunar Magma Ocean is anticipated to solidify from the bottom up. After approximately 80% of the Lunar Magma Ocean has crystallized, mineral plagioclase and other minerals crystallize together. Rocks primarily composed of plagioclase (i.e., anorthosite) form and drift towards the Moon's surface, creating its primordial crust.