107 



iC The water, he observes, is most probably not essential ; 

 and in that case, from his experiments, it would be : 

 Quartz . . . 0-261 

 Oxide of Zinc . 0.739 



1-000 



" He also says he has found this species of Calamine 

 among the productions of Derbyshire in small brown 

 crystals, &c. ; and their form seems, as far as minuteness 

 and compression together will allow of judging, nearly or 

 quite the same as those of Regbania ; and the least atom of 

 them on being heated immediately evinces their nature by 

 the strong electricity it acquires. On their solution in 

 acids they leave Ouartz." 



When we first looked at this specimen, not having seen 

 such before, we did not know what it was ; but on trial 

 with the blowpipe, as it passed into nocculi and dissipated, 

 we soon determined it j nor did we consult any author, 

 until we had made sketches of the crystals, when we were 

 not a little pleased to find our observations agree with those 

 of others as to the form of them. There are some additional 

 facets not mentioned in Haiiy, which, although very 

 minute, were sharp enough to be discerned. It is very 

 curious to see a small portion gently warmed, how readily it 

 attracts a few scrapings of paper which cling to it for some 

 time. 



These little elegant crystals stand on a gangue of red 

 Sulphate of Barytes crystallized on the surface in little 

 plates of a pinkish colour, modified something like tab. Q6 } 

 bottom Jigure. There are some blotches of marie mixed 

 with the gangue. We also find, on the surface, Sulphuret 

 of Zinc and Sulphuret of Copper in somewhat irregular 

 groups of crystals ; the first of a gray colour, the latter of 

 a golden hue, and almost in tetraedrons. There are some 

 nearly metastatic crystals of Carbonate of Lime, and a few 

 crystals of Galaena. 



