Analcim is an aqueous aluminosilicate from the group of zeolites, Na (AlSi2O6) .H2O. It was named in 1797 by R.J. Haüy from the Greek analkimos - weak or without the use of force. Analcim is most often white, but also pink, gray and colorless. They often form limited crystals, a typical 24-walled deltoid wall resembling a soccer ball or grainy, fine-grained to solid aggregates. It occurs in the veins of alpine paragenesis and in the cavities of igneous rocks, especially basalts and almond trees. More info