374 E. F. PITTMAN. 
A qualitative determination showed presence of phosphoric acid, 
chlorine, a little sulphuric acid, and antimony. 
Johnstonite 1—Variety of galena—Some peculiar pieces of 
galena were found from which some of the lead had been eliminated 
leaving the sulphur free. This variety is possibly identical with 
the “ Johnstonite” reported by Dana. 
Stibnite—Antimony trisulphide (Sb,S,)—Rare, in fine capillary 
crystals on siderite associated with mispickel. 
Volgerite—Hydrous antimonic acid.—A white earthy oxide of 
antimony, occurring in small quantities with stromeyerite and 
sometimes chloride of silver ; earthy. Quantity too small to test. 
thoroughly. Contains nine or ten per cent. water. Rather a 
doubtful species ; insoluble or nearly soin HCl. The only sample 
assayed for silver gave one hundred and seventy-four ounces. 
Stibiconite—(Sb,0,H,O.)—-Very rare, earthy. Found enclosed 
in one lump of silver chloride. 
Mispickel—Arsenical pryites.— Rather rare, found scattered in 
small amorphous lumps through siderite. 
Cobalttte—Sulph-arsenide of cobalt (CoS,CoAs,)—Rarely in 
crystals. Amorphous variety common; generally argentiferous. 
through admixture with dyscrasite and sometimes fahlerz. Occurs 
at various depths in calcite. On exposure soon oxidises to the 
arsenate (erythrite). 
Lrythrue—Hydrous cobalt arsenate.—One specimen found only 
am situ, crystallised in stellate form on siderite. 
Copper ores—None interesting; only small quantities found. 
Varieties consist of malachite, azurite, chenevixite, brochantite, 
bornite and chalcopyrite, the latter most plentifully. 
Aurichalcite—Basic carbonate of zinc and copper.—Rare; very 
handsome specimens were found forming stalactite shaped masses 
in a vugh near the deposit of rich ore. The inside of these speci- 
mens was filled with dyscrasite, iodide of silver and gossan. 
