1816 Edin. Rev. XXVI. 163Silceo-calcareous sand. 
1822 J. Imison Sci. & Art II. 78A permanent acid gas, called the Siliceo-fluoric acid. 
1839 H. T. De la Beche Rep. Geol. Cornwall, etc. vii. 203A hard siliceo-felspathic compound. 
siliceo-
combining form 
Etymology: Latin siliceus siliceous 
 : siliceous and 
< siliceocalcareous >
< siliceofeldspathic >
< siliceocalcareous >
< siliceofeldspathic >