Miner alogical Notices. 207 



Jaiilij in the Cordilleras of Peru, at a height of I43OOO feet (French), 

 and also from a mine near Freiberg, along with other copper ores. 

 It occurs in Peru abundantly in large masses containing occa- 

 sional small druzes of crystals, imbedded with tennantite in crys- 

 talline limestone. The Freiberg mine affords it in acicular crys- 

 tals, which are distinguished from other glances by the prismatic 

 cleavage. Lustre metallic, slightly imperfect; color iron-black; 

 streak black; H.=3 or that of calc spar ; G. =4-43-4*445; easily 

 pulverized. Crystallization trimetric ; the crystals presenting the 

 planes of a rhombic and rectangular prism ; rhombic prism 

 ( a:P) = 98^ IP : cleavage prismatic, perfect ; brachydiagonal and 

 macrodiagonal distinct ; basal indistinct ; octahedral (P) in traces. 

 Fracture uneven. B.B. in a glass tube, decrepitates and gives 

 with little heat a sublimate of sulphur; in a stronger heat, fuses 

 and produces sulphuret of arsenic of a reddish yellow color; on 

 charcoal it gives out arsenous acid, oxyd of antimony and oxyd 

 of zinc; and in the reduction flame, it finally yields with borax 

 a globule of copper. Analysis of the Peruvian ore afforded 

 Plattner, (ibid, p. 386) 



S As Sb Cu Fe Zn Ag 



32'222 11-599 1-613 47-205 0565 0-228 0017=99-4-4g 



This gives the ratio for the sulphur, — the arsenic and anti- 

 mony, — and the copper, iron and zinc, 1605: 197: 1214, or vary- 

 nearly 8:1:6, whence he deduces the formula (writing Cu for 

 copper and the allied metals) 



[8CuS+AsS8] + [2«uS+AsSS], 



or perhaps 3(Cu, Fe, Zn) S + (As, Sb) S % 



equivalent to sulphur 32-64, arsenic 19-11, copper 48 25. 



Carmine Spar; F. Sandberger, (Pogg. Ann. Ixxx, 391.) 



Carmine spar is a red mineral occurring with cube ore (Beudan- 



< tite) at Horhausen in Saxony, in quartz and brown iron ore. 



Crystallization not distinct, probably rhombic ; occurs in clus- 

 ters of fine needles and spheroidal forms of a columnar structure; 

 cleavage parallel to the faces of a rhombic prism. Lustre vitre- 

 ous, but pearly on a cleavage face ; color carmine to tile-red ; pow- 

 der reddish-yellow ; translucent; brittle; hardness 25, or between 

 rock salt and calc spar. B.B. on charcoal fuses easily to a steel 

 gray globule, giving out arsenical vapors. With soda, yields a 

 globule of lead, and with borax the reaction of iron is obtained. 

 In a glass tube over a spirit lamp, does not change. Heated in 

 concentrated muriatic acid it dissolves very easily to a gold-yellow 

 fluid, in which chlorid of gold does not deposit metallic gold ; 

 soluble in nitric acid. From these and other trials, it is inferred 

 that the mineral is an anhydrous arsenate of oxyd of lead and 

 ^oa ; the quantitative relations have not been determined. 



