hyalophane

[ hahy-al-uh-feyn, hahy-uh-luh- ]
/ haɪˈæl əˌfeɪn, ˈhaɪ ə lə- /

noun Mineralogy.

a variety of orthoclase in which some of the potassium is replaced by barium.

Origin of hyalophane

First recorded in 1850–55; hyalo- + -phane