marcasite/ˈmɑ:kəsaɪt; `mɑrkəˌsaɪt/ n[C, U](piece of a) type of crystallized mineral, used as jewellery 白铁矿, 白铁矿石（用作饰物） [attrib 作定语]a marcasite ring, ie a ring with a marcasite set into it 白铁矿石戒指.
牛津英汉双解词典