This gypsum generally forms only small beds, and is mixed with a great deal of fibrous gypsum.

At the Salvages, which islands La Perouse took at a distance for masses of scoriae, even fibrous gypsum is found.

The second formation is composed of fibrous gypsum, placed either in the molasse or new sandstone, or between this and the upper limestone.

We find disseminated in it, as we have already observed, either in nests or in small veins, selenite, and sometimes, though seldom, fibrous gypsum.