noun
blue vitriol; chalcanthite
Technical term for copper(II) sulfate pentahydrate, a blue crystalline mineral. Used in chemistry, mineralogy, and traditional contexts.
胆礬は銅の精錬や顔料に利用される。
Blue vitriol is used in copper refining and as a pigment.
この結晶は胆礬と呼ばれる硫酸銅の一種だ。
This crystal is a type of copper sulfate called chalcanthite.
硫酸銅 is the general chemical term for copper sulfate, while 胆礬 specifically refers to the pentahydrate mineral form (blue vitriol).
From Chinese 膽礬／胆矾 (dǎnfán), literally 'gall alum', referring to its bitter taste and crystalline appearance. The Japanese reading たんばん is the on'yomi of the kanji.