A mineral which occurs massive, or more commonly in four or eight sides prisms, terminated by four sided pyramids. It takes its name from its long crystals, often marked with deep longitudinal channels, and collected in groups or masses of parallel, diverging or intermingled prisms. It is the radiated, foliated and compact scapolite of Jameson, and the paranthine and Wernerite of Hauy and Brongniart.

A grayish white mineral occuring in tetragonal crystals and in cleavable masses. It is essentially a silicate of alumina and soda.