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The synthesis and structural characterization of two novel trivalent neodymium microporous silicates whose structures are reminiscent of the structure of mineral montregianite of the rhodesite group, and their infrared light-emission properties are reported. The compound KNa 2 Nd[Si 8 O 19 ]·5H 2 O ( 1 ) crystallizes in the orthorhombic  Pmma  space group:  a  = 23.9016(17) Å,  b  = 6.9980(5) Å,  c  = 6.5474(5) Å. Heating  1  at 200 °C for 40 min affords a new partially dehydrated phase, KNa 2 Nd[Si 8 O 19 ]·2.8H 2 O ( 2 ), also crystallizing in the orthorhombic  Pmma  space group:  a  = 23.923(4) Å,  b  = 6.9950(11) Å,  c  = 6.5474(10) Å. Compound  2  is the hydrated phase with the lowest content of water molecule reported to date in the rhodesite mineral series.

Synthesis and structure of new microporous Nd(III) silicates of the rhodesite group