Preparation and characterization of Na1.5K0.5Ca6Si4O15 (Na1.5K0.5Ca6[SiO4]2[Si2O7]) and Na1.41K0.19Ca2.20Si2O7: two new phases in the system Na2O–K2O–CaO–SiO2
Volker Kahlenberg|Michael Jean-Philippe Mayerl|Daniela Schmidmair|Hannes Krüger|Martina Tribus
European Journal of Mineralogy