XLVII.
HAUYNA.
From the
illustrious Abbé Haiiy, one of the most eminent mineralogists, this
stone takes the name which, in compliment to him, was given it by
Monticelli.
It
was first discovered by Gismondi, who, having met it associated with
mica and green pirosene, on Mounts Laziali, called it, hence, Lazialue.
Afterwards,
Monticelli found it on Vesuvius. The hauyna, then, is a substance
composed of alumina, silex, potash, protoxide of iron, sulphuric acid
and soda, and of which, according to the celebrated Luigi Ceselli, the
exact analysis is as follows :
