Generally, restite is composed of a predominance of mafic minerals because these are harder to melt (see Bowen's reaction series).
Typical minerals are amphibole, biotite, pyroxene, ilmenite or other iron oxides and some plagioclase feldspar.
Cordierite in restite inclusions is unstable at low pressures; this reverts to Al-rich mica and quartz during ascent with the entraining magma.
These reactions also involve consumption of significant quantities of water, and hence, will preclude the generation of a hydrothermal solution.
Similar to the reactions occurring in S-type granites, the restite minerals will revert to hornblende and plagioclase upon ascent, resorbing water and precluding generation of hydrothermal solutions.