MINERALOGY. 161 



Hannay. Color, dark steel-gray; composition, a sulphide 

 of lead and manganese; locality unknown. 



ProtovermicuUte. A hydrous micaceous mineral from 

 Magnet Cove, Ark. ; closely related to culsageeite ; described 

 by Dr. Koenig. 



Polydimite. Occurs in regular octahedrons, of a steel- 

 gray color and brilliant metallic lustre. According to Las- 

 peyres, it is essentially a sulphide of nickel (R 4 S 5 ), though 

 quite distinct from millerite. Locality, Sayn-Altenkirchen. 



Rogersite. Anew hydrous columbate of yttria, named by 

 Dr. J. L. Smith in honor of Professor William B. Rogers. It 

 occurs as a white incrustation, with mammillary structure, 

 upon the samarskite of Mitchell County, N. C. 



Silaonite. A selenide of bismuth (Bi 3 Se) ; described by 

 Professor Fernandez as occurring with guauajuatite at the 

 mines of Guanajuato, Mexico. 



Sipylite. A new columbate, of complex composition, oc- 

 curring, as described by Professor Mallet, with allanite of 

 Amherst County, Va. It contains as bases zirconium, erbi- 

 um, yttrium, lanthanum, cerium, didymium, uranium, iron, 

 and calcium, with smaller amounts of other elements. It 

 occurs indistinctly crystallized, has a brownish-black color 

 and a resinous lustre. Its specific gravity is 4.89. It is re- 

 markable for glowing very brilliantly in the blowpipe flame. 



Sonomaite. A hydrous sulphate of aluminum and mag- 

 nesium collected near the geysers of Sonoma County, Cal., 

 and described by E. Goldsmith. It appears in colorless 

 crystalline masses with silky lustre. 



Sphwrocobaltite. Found in spheroidal forms, with roselite, 

 at Schneeberg, Saxony. Its color is rose-red, and in compo- 

 sition it is a carbonate of cobalt (CoC0 3 ). Described by 

 Weisbach. 



Strengite. A hydrous phosphate of iron, allied to scoro- 

 dite. It occurs with cacoxenite in spherical incrustations of 

 a generally white color. Described by Nies as found at the 

 iron-mines near Giessen, Hesse ; and since identified by Koe- 

 nio; from Rockbridge Countv, Va. 



Szmikite. A hydrous sulphate of manganese ; described 

 by Schroeckinger as occurring in stalactitic forms at Felso- 

 banya, in Transylvania. 



Uranocircite. Described by Dr. Weisbach as a hydrous 



