| phillipsite | (n) a group of white or reddish crystalline minerals of the zeolite family consisting of a hydrous silicate of calcium and potassium and aluminum |
| Phillipsite | n. [ So named after John Phillips, an English mineralogist. ] (Min.) A hydrous silicate of aluminia, lime, and soda, a zeolitic mineral commonly occurring in complex twin crystals, often cruciform in shape; -- called also |