journal article
LitStream Collection
The System CaAl2Si-2O8-Ca2Al2SiO7-NaAlSiO4
doi: 10.1086/625446pmid: N/A
The thermal-equilibrium relationships in the system $$CaAl_2Si_2O_8-Ca_2Al_2SiO_7-NaAlSiO_4$$ have been experimentally investigated by the quenching method. The data are tabulated, and the results are presented in equilibrium diagrams. Complex solid solutions in all the crystalline phases render the system nonternary throughout, and courses of crystallization must be viewed in terms of the quaternary system of the four component oxides. The composition of gehlenite mix-crystals obtained in this investigation is best expressed by assuming solid solution with a hitherto unknown "molecule," of the composition $$CaO.2Al_2O_3$$.