noun
smithsonite; zinc spar
A zinc carbonate mineral; technical term used in mineralogy and geology.
菱亜鉛鉱は亜鉛の重要な鉱石鉱物の一つである。
Smithsonite is one of the important zinc ore minerals.
The kanji 菱 (rhombus) refers to the crystal shape, 亜鉛 (zinc) indicates the metal content, and 鉱 (ore/mineral) marks it as a mineral name. The reading りょうあえんこう is a Sino-Japanese compound.