280 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



ety of this species. Found at the Ilimmelsfiirst mine at Frei- 

 berg, Saxony; described by A. Weisbach. 



Arr/ienite. A silico-tantalate of zirconium, iron, cerium, 

 and erbium containing water. Its specific gravity is 3.68, 

 and in color it resembles a reddish yttrotantalite. Found 

 with gadolinite, yttrotantalite, and other related minerals at 

 Ytterby ; described by A. E. Nordenskibld. 



Atopite. An antimonate of calcium chiefly, containing also 

 iron, manganese, sodium, and potassium in small quantities. 

 It occurs in hair-brown octahedral crystals, which are semi- 

 transparent and have a greasy lustre. Found with mimetite 

 and rhodonite at Langban, Sweden ; described by A. E. Nor- 

 denskiold. 



Barcenite. An antimonate of calcium, mercurv, and triad 

 antimony. It is an opaque, nearly black mineral, with a dull 

 earthy lustre. It has a more or less perfect columnar struct- 

 ure, due to the livingstonite from which it was originally 

 formed. It is so intimately mixed with cinnabar and anti- 

 monic acid that its true composition was obtained only by 

 calculation from the results of an analysis of the mixture. 

 From Iluitzuco, State of Guerrero, Mexico ; described by J. 

 W. Mallet. 



Barylite. A silicate of aluminium and barium. It occurs 

 in crystalline masses, showing two distinct directions of cleav- 

 age. Found at Langban, Sweden ; described by C. W. Blom- 

 strand. 



Blomstrandite. A hydrated columbo-titanate of uranium. 

 It occurs in black opaque masses; but in extremely thin 

 fragments the mineral is translucent, and has a brownish-red 

 color. From Nohl, in Sweden ; described by C. II. Lindstrom. 



Bolivite. A sulphide of bismuth essentially, witli also the 

 oxide of bismuth. From Tazna, Bolivia; described by Do- 

 meyko. 



Bravaisite. A hydrous silicate of aluminium, potassium, 

 calcium, and magnesium. It lias a gray, slightly greenish 

 color; its appearance is argillaceous, and its structure thinly 

 laminated, though under the microscope it is seen to be some- 

 what fibrous. Found in the coal-measures of Noyant, France ; 

 described by M. E. Mallard. 



Cleveite. A mineral containing the oxides of the follow- 

 ing metals: uranium, yttrium, erbium, cerium, thorium, and 



