Crystallization path of diopside-wollastonite-silica systems
The diopside–wollastonite–silica system ($\ce{CaMgSi2O6-CaSiO3-SiO2}$) was never studied for crystallisation paths in igneous systems. This is not a system encountered in terrestrial magmas, so no one bothered.

However, it was studied as part of a more general lime–magnesia–silica ($\ce{CaO-MgO-SiO2}$) system by material scientists and they came up with this:



Source: Steel Data

You can see small fields for "Diop" and "wolla" slightly above the centre of the diagram. This is not an easy diagram though, and it's of limited use to geologists. If you're studying ternary systems I recommend you go through these instead: Ternary Phase Diagrams