Geyserite \Gey"ser*ite\ (g[imac]"z[~e]r*[imac]t or
g[imac]"s[~e]r*[imac]t; 277), n. [From Geyser.] (Min.)
A loose hydrated form of silica, a variety of opal, deposited
in concretionary cauliflowerlike masses, around some hot
springs and geysers.
[1913 Webster]