Summary: The solidus temperatures (IPTS-68) and melilite compositions (mole %) determined for some four-phase assemblages in the system CaO-MgO-Al₂O₃-SiO₂ are: anorthite, diopside, spinel melilite (Åk₈₁Geh₁₉), 1236·5 °C; diopside, spinel, forsterite, melilite (Åk₈₃Geh₁₇), 1238 °C; foresterite, spinel, monticellite, melilite (Åk₈₂Geh₁₈), 1351 °C; monticellite, merwinite, spinel, melilite (Åk₅₂Geh₄₈), 1378 °C; dicalcium-silicate, Ca₅MgSi₃O₁₂, spinel, melilite (Åk₅Geh₉₅), ca. 1412 °C; dicalcium-silicate, Ca₆MgAl₈SiO₂₁, spinel, melilite (Åk₄Geh₉₆), ca. 1347 °C.