236 MINEEALOGT. 



copper-ore in regular tetrahedra. These minerals hare been formed 

 within 16 centuries, probably by the reducing action of vegetable matter 

 in the mud upon sulphates held in solution in the mineral water. The 

 bronze would yield the copper, and perhaps also the antimony in the 

 tetrahedrite. The association and mode of occurrence of these recently 

 formed minerals strongly resemble those of the natural species. 



F. W. 11. 



Daubree, [Prof.] Formation contemporaine dans la source thermale de 



Eourbonne-les-Bains (Haute-Marne) de diverses especes minerales, 



galene, anglesite, pyrite et silicates de la famille des zeolithes, 



notamment la Chabasie. [On the Recent Formation of Galena, 



Anglesite, Pyrites, Chabasite, etc. in the hot Springs of Bourbonne- 



les-Bains (Haute-Marne).] Compt. Bend. t. Ixxx. pp. 604-607, 



and Bull. Soc. Geol. France, 3 ser. t. iii. pp. 307-309. 



A continuation of the working at Bourbonne-les-Baius has revealed 



the existence of galena and anglesite on a fragment of old lead. Limonite 



and iron-pyrites have also been found. The Roman concrete contains 



chabasite and other zeolites similar to those in the well-known case of 



Plorabieres. F. W. R. 



. Association dans I'Oural du platine natif a des roches a base 



de peridot ; relation d'origine qui unit ce -metal avec le fer chrome.] 



[Association, in the Urals, of Native Platinum with rocks having 



a peridote base ; Relation as to Origin, uniting this metal with 



Chrome-iron.] Co7npt. Bend. t. Ixxx. pp. 707-714, and Bull. Soc. 



Geol. ^France, 3 ser. t. iii. pp. 311-314. 



It has long been supposed that the platinum washed in parts of the 



Ural had its origin in serpentine rocks. From the examination of 



pebbles, associated with the platinum, the writer concludes that the 



matrix of the metal near Nischne-Tagilsk consists of peridote, more or 



less altered to serpentine, and accompanied by diallage. He discusses 



the relation of the platinum to the chrome iron-ore, in which it is 



frequently found ; and compares the platinum-bearing rocks with certain 



meteoric stones. F. W. R. 



Notice complementaire sur la formation contemporaine de 



mineraux par les sources thermales de Bourbonne-les-Rains (Haute- 

 Marne) : production de la phosgenite. [Additional Note on the 

 Formation of Minerals by the Thermal Springs of Bourbonne- 

 les-Bains : Production of Phosgenite.] Compt. Bend. t. Ixxxi. pp. 

 182-185 ; see also VInsti tut, Aug. 4. 

 Lead-pipes have been found coated with the rare mineral phosgenite 

 (chloride of lead), covered with a crust of mixed galenite and gypsum. 



Exemples de formation contemporaine de la pyrite de fer 



dans les sources thermales et dans de I'eau de mer. [Recent For- 

 mation of Iron-pyrites in Thermal Springs and in Sea- water.] 

 Compt. Bend. t. Ixxxi. pp. 854-859. 

 Announces the discovery of iron-pyrites associated with crystals of 



