24 Minei'alogical Notices, 



LONCIIIDITE. BY M. BREITHAUPT, 

 [Poggendorff's Annalcn, vol. Ixxvii. p. 135.] 

 Is the name given by Breithaupt to the same mineral which 

 he formerly described by that of Kansimkies; it has hitherto 

 occurred but in small quantity in the Kurprinz Friederic 

 August mine at Grosscliirma, near Freiberg, always upon .it 

 copper pyrites, accompanied by iron pyrites, spathic iron, 

 horn-stone, quartz, &c. ; also at the Sauschwart mine near 

 Schneeberg, and likewise at Coak's Kitchen in Cornwall ; also 

 upon copper pyrites. It has a brilliant metallic lustre, is of a 

 tin-white colour, sometimes variegated, and sometimes with a 

 greenish iridescence. Streak black, differing in fact in nothing 

 from the common arsenical pyrites as regards lustre, colour 

 and streak. Hardness = 7]; — 7| ; spec. grav. 4'-925, 4-936, 

 4-938, 4-962, 5-001. From the results of his analyses, Platt- 

 ner declares Lonchidite to be a bisulphuret FeS\ combined 

 with some arsenical pyrites FeS'^+ FeAs^, in which latter how- 

 ever a part of the iron is replaced by copper and cobalt. His 

 analysis gave— 



Sulphur .... 49-612 



Arsenic .... 4*396 



Iron 44-225 



Cobalt 0-354 



Copper .... 0-749 



Lead 0-204 



99-540 



KONICHALCITE. BY MM. BREITHAUPT AND FRITZSCHE. 



[Poggendorff'*s Annalen, vol. Ixxvii. p. 139.] 

 This mineral was obtained from Spain, and has long been 

 in the Freiberg collection. It has a slight vitreous lustre, a 

 pistaceous emerald-green colour, with a similar coloured 

 streak, and is transparent at the edges. Cleavage splintery, 

 passing into fine granular. Brittle. Hardness 5| — 5| ; spec, 

 grav. = 4- 123, Breithaupt. The analysis is by Fritzsche. 

 Reckoning the vanadic as phosphoric acid, the formula 



2(3CuO-fAs05)6CaO + P05 + 5HO 

 results as follows : — 



