noun
bismuthinite
A mineral name used in geology; refers to bismuth sulfide (Bi₂S₃).
輝蒼鉛鉱はビスマスの重要な鉱石鉱物である。
Bismuthinite is an important ore mineral of bismuth.
The kanji 輝 (ki, 'shine'), 蒼鉛 (sōen, 'bismuth'), and 鉱 (kō, 'ore') combine to describe a shiny bismuth ore. The reading is on'yomi-based.