310 



Chronicles of Science. 



[April, 



of metallic tin weighing 505 grains, at Oruro, in Bolivia. The analyses 

 made gave the following general result 



Tin 



Lead 

 Copper . 

 Iron . . 

 Arsenic . 

 Insoluble Gangue 



79-52 



19-71 



0-09 



0-19 



Trace 



0-49 



100-00 



M. A. Kiviere has recently published a new treatise on Miner- 

 alogy, which from its completeness, we can strongly recommend to 

 the students of this Science. He treats very fully the Constitution of 

 Minerals, their Properties, Physical and Chemical Characters, and he 

 gives a valuable chapter on the Relations between the Crystalline Form 

 and the Chemical Composition of Minerals.* 



M. Marc Delafontaine communicates " Materiaux pour servir a, 

 l'Histoire des Metaux de la Cerite et de la Gadolinite," to the 

 ' Bibliotheque Universelle.'f The more recent communication upon 

 Terbia and Yttria enters fully into the examination of these earths 

 by spectrum analysis, and brings forward several new and important 

 facts. In the same manner Didymium, Erbium, and Terbium are ex- 

 amined, and in a note " Sur les Carbures des Metaux Yttro-Ceriques," 

 some curious chemical reactions are described. 



In an ancient Celtic tomb at Mane-er-H'roek, in Lockmariaguer, 

 in the Province of Morbihan, has been found a mineral much resem- 

 bling the turquoise. This mineral had evidently been used like the 

 turquoise, for ornament by some savage tribe once inhabiting this 

 district. It has been examined by M. A. Damour, who finds it to 

 consist of — 



Phosphoric Acid . 



Alumina 



Oxide of Iron 



Lime . 



Oxide of Manganese 



Water . . > 



Silicious residue . 



0-4258 

 0-2957 

 0-0182 

 0-0070 

 Traces 

 0-2362 

 0-0210 



1-0039 



Differing as this mineral does, in the proportions of its principal 

 constituents, and in its exterior character, from the turquoise, M. Da- 

 mour proposes to distinguish it by the name of Callais. Many miner- 

 alogists distinguish the turquoise by the name of Calaite ; Pliny having 

 described a similar stone under the name of Callais. Damour desires 

 to restrict the name of turquoise to the well-known precious stone, and 



* * Precis de Mineralogie, comprenant les Principes de cette Science ; la 

 Description des Mineraux et des Koches, leurs principaux Usages, &c." Paris : 

 Fh-min Didot, Freres, Fils et Cie. 



t ' Archives des Sciences Physiques et Naturelles.' Geneva. No. 85. January, 

 1865. 



