noun
marcasite
A mineral, iron sulfide (FeS₂), similar to pyrite but with a different crystal structure. Used in jewelry and as a collector's mineral.
白鉄鉱は黄鉄鉱とよく似ているが、結晶構造が異なる。
Marcasite closely resembles pyrite, but has a different crystal structure.
Pyrite (fool's gold), a more common iron sulfide mineral with a different crystal structure and often a brassier color.
From 白 (white) + 鉄鉱 (iron ore), referring to the mineral's pale metallic luster.