182 ^cii niific [iittl'hicuce—MiiteralDji/ ait:l Chciuislrtf, 



position is constant ; and its title to be roganleil as a new mineral 

 species is, acroiding to M. DufVcnoy, undoubted, for it is founded 

 both on composition and crystallograpliic characters. It occurs in a 

 dendritic form, or in small octahe(h-al crystals; it is of a silver-white 

 colour like the amalgam of Moschel-Landsbcrg, but differs from it 

 in being malleable. It can be extended by the hanuncr, and cut l)y 

 the knife. The proportions of its constituent parts are 8G.5 silver, 

 and 13.5 mercury ; while those of the jMoschel-Landsberg species arc 

 36 silver and 64 mercury. The name of Arquerite is proposed for 

 the new mineral. 



12. Bromide of Silver in Mexico. — Berthier has discovered the bro- 

 mide of silver in a perfectly pure condition in the mineral kingdom. 

 In the district of Phitoros in Mexico, there is a silver mine where 

 the chief ore is chloride of silvei". This substance is there ternied 

 Plata azul (blue silver), and, along with it, grains and small crystals 

 occur, which receive the name of I'latn vercle (green silver) ; the 

 latter, which ai'e green only externally, are internally of a beautiful 

 yellow colour, and, acc;)rdin<T to Bertliier's analysis, are pure bromide 

 of silver. The mine from which the analysed ore was extracted 

 bears the name oi' San Otiofrr. It is ruixcd v-ith chloride of silver, 

 carbonate of lead, oxide of iron, and a little quartz containing alumina. 

 Its powder is yellow, but exposure to the light soon produces the su- 

 perficial green tint. Berthier has subsequer.tly found traces of 

 bromide of silver in a silver ore containing chloride of silver from 

 Huelgoat in France. — {BerzrUiis'' Jahrcs-Berirht, 1842.) 

 i 13. Bromiclr of Silver iiiChili. — M. Berthier, who has verified apart 

 of the analyj-es of M. Domeyko, has recognised in the argentiferous 

 minerals from Chanavcillo, designated Paros and Collorados, the 

 bromide of silver, which he had previously discovered in the ores of 

 Peru. The proportion of the bromide is very variable, but it is at 

 least equal to that of the chloriile, so that this new species holds 

 an important position in the mineral ri( lies of Chili and of Peru. 



14. Bamlitr. — Erdmanii has described under this name a new mine- 

 ral fromBamle in Norway. It forms a fibrous, white or gray, trans- 

 lucent mass, having an uneven and splintery fracture; a specific 

 gravity = 2.984^ and a hardness a little above 6. It consists of 



Silica 59.90 Oxygen .... 20 oG a 



Ahiminn, . . . 40.73 .... 19.31 2 



Oxide of Iron. . 1.04 



Lime, .... 1.04 



Fluorine, ... A trace. 



99.71 



—Lcr^elitis J-ihr'.-^Urri'hl . U312. 



