hydrophane

== English == === Etymology === From hydro- (water) +‎ -phane (“appearing”). === Noun === hydrophane (countable and uncountable, plural hydrophanes) (mineralogy) A semitranslucent variety of opal that becomes translucent or transparent on immersion in water. ==== Related terms ==== hydrophanous === Further reading === David Barthelmy (1997–2026), “Hydrophane”, in Webmineral Mineralogy Database. “hydrophane”, in Mindat.org‎[1], Hudson Institute of Mineralogy, 2000–2026.