Schematic model showing the evolution of crystal shapes, lockup crystallinity, and lockup temperatures during magma emplacement, mush formation and maturation. T_liq = liquidus temperature; T_sol = solidus temperature; T_lockup = lockup temperature, i.e. the temperature at which crystallinity reaches maximum packing fractions for a given crystal shape and a rheologically locked crystal framework (i.e. mush, blue [darker] area) forms. Schematic 3D short/intermediate crystal dimension aspect ratios (S/I) for different mush reprocessing stages are shown. Note that with increasing mush maturity, the lockup temperature decreases and the time spent at eruptible magma conditions increases (orange [lighter] area). Modified after Cooper & Kent (2014).