Min. Also faasait. [Named in 1796 by Dolomieu, and in 1817 by Werner, after Fossa (in the Tyrol) where it was found: see -ITE.] † a. Foliated zeolite (obs.). b. A variety of pyroxene, containing a little alumina in addition to the elements of sahlite.
1814. T. Allan, Min. Nomen., 46. Foliated zeolite … Fassait. Ibid., 5. Fassaite of Werner is a variety of augite.
