semseyite Min.
(ˈsɛmsiːaɪt)
[ad. Hung. semseyit (J. S. Krenner 1881, in Magyar tudományos Akad. {Eacu}rtes. XV. 113), f. the name of Andor Semsey (1833–1923), Hung. nobleman and amateur mineralogist: see -ite1.]
A monoclinic sulphide of lead and antimony, Pb9Sb8S21, found usu. as grey or black tabular or prismatic crystals with a metallic lustre.
| 1886 Jrnl. Chem. Soc. L. 313 Semseyite from Felsöbánya; small, grey tabular crystals. 1920 Brit. Mus. Return 142 in Parl. Papers XXXVI. 673 Semseyite from Dumfriesshire. 1955 [see rosetted a. 1 a]. 1976 Mineral. Abstr. XXVII. 306/2 Genetic antagonism between semseyite..and boulangerite..may have been caused by variation in oxidizing power of sulphur between the two media. |