AlINERALOGY OF CHALANCHES. .131 



common as a mineralizer, and has sometimes occurred na- 

 tive in a whitish yellow powder. The anthracite is found Anthracite, 

 foliated, scoriform, striated, and earthy; and is frequently 

 traversed by small veins of quarts, exhibiting very pretty 

 Crystallizations, that form a striking contrast with it* 



We now come to the fourth class, that of metallic sub- 4th class, 

 stances. 



Gold has been reported to have been found atChalanches Gold, 

 native, or alloyed with native silver, but this is erroneous. 

 Mr. Schreiber hoivever, in his analysis of the copper pyrites 

 of the vein of St. Lewis found it to be auriferous. 



Native silver is very abundant in the veins at Chalanches. Native silver. 

 It has uever been found crystallized, but in various forms, 

 as branchy, filamentous, capillary, lamellar, granulous, 

 amorphous, pulverulent, and earthy. These eight varieties 

 are mixed with a number of different substances, and in par- 

 ticular with carbonate of lime, quartz, epidote, chlorite, pe- 

 ridot, copper, arsenical nickel, carbonated nickel, earthy 

 Oxide of cobalt, arseniated cobalt, oxide of iron, oxide of 

 manganese, oxide of mercury, lead, antimony, &c. The 

 native silver is found sometimes mixed with only one of 

 these substances, at others with two or three of them, but 

 more frequently with all of them together. 



Antimonial silver occurs very rarely. Antimonial 



Sulphuretted silver is very rare in well defined crystals : J?T"J* 

 but it is found lamellar, filamentous, amorphous, and scori- silver. 

 form, disseminated in the same gangues as the native silver, 

 and with the same mixtures. 



Muriate of silver has never been found crystallized but Horn silver. 

 once, when it was in a perfect cube, and the first time it 

 had been noticed. It has since occurred frequently in a vio- 

 let powder on the surface of native silver, or argentiferous 

 cobalt ores; but it never forms more than a very thin coat 

 on it. 



Sulphuret of silver and antimony is found occasionally in Sulphuret of 



small amorphous masses. Carbonate of lime tinged with Sllver and anti- 



. i « . , • mony, 



oxides of iron and manganese are its most common gan- 

 gues. 



Beside these five states silver has frequently been found Argentiferous 

 in sulphuret of lead, gray copper ore, arsenical nickel, &c.'; ore *' 



K 2 but 



