noun
schorl; black tourmaline
Mineralogy term for the black variety of tourmaline.
黒電気石は、トルマリンの一種で、鉄分を多く含むため黒色を呈する。
Schorl is a type of tourmaline that appears black due to its high iron content.
電気石 is the general term for tourmaline, while 黒電気石 specifically refers to the black variety, schorl.
Compound of 黒 (black) and 電気石 (tourmaline), literally 'black tourmaline'.