A new naturally-occurring nanoporous copper sheet-silicate with 6482 cages related to synthetic “CuSH” phases

Projection onto (010) of the structure of the natural nanoporous sheet silicate Na2CaCu2Si8O20·H2O showing the double sheet of corner-linked SiO4 tetrahedra, intralayer Na and interlayer Na, Ca Cu and H2O. Small green sphere Cu, large blue spheres Ca, orange purple and yellow small spheres Na, large grey sphere H2O molecules. Bonds from inter/intralayer species to sheets have been omitted for clarity.