180 PHYSIOGRAPHY. 



Electric Calamine. 



1. la some of the crystals of Electric Calamine, dissimilar modifica- 

 tions have been observed upon the opposite extremities of the same crys- 

 tals, as in Tourmaline ; attended also with the evolution of different 

 kinds of electricity, as in that mineral. Like the Tourmaline, the elec- 

 tric excitation is occasioned by common changes of atmospheric tempe- 

 rature ; and is not destroyed in the crystals, even after their exposure to 

 a red heat. 



Before the blow-pipe, it decrepitates a little, loses its transparency, 

 intumesces, and emits a green phosphorescent light. It is infusible with- 

 out addition, but is dissolved by borax into a clear glassy globule, which 

 becomes opake on cooling. It is phosphorescent by friction. Reduced 

 to powder, Jt is soluble in heated sulphuric or muriatic acid, and when 

 cooled, it forms a jelly. 



2. Analysis. 



By BERTHIER. By BERZEL.ITJS. 

 Oxide of zinc . 06-00 . . 68-37 

 Silica . . . 25-00 . . 26-23 

 Water . . 9-00 . . 7-40 



This species has been found artificially produced, lining the throats 

 of iron furnaces, in Salisbury, (Conn.) where the ore employed is the 

 Brown Iron-Ore. The furnaces are constructed of mica-slate. The 

 mineral presents itself in coatings, quarter of an inch in thickness, having 

 botryoidal shapes with drusy surfaces. Its color is a delicate straw- 

 yellow. 



3. Electric Calamine is found along with Calamine in veins belong- 

 ing to various classes of rocks, but chiefly calcareous* ones. It is usually 

 associated with Blende and Galena. 



4. Considerable quantities occur at Bleiberg and Raibel in Carinthia, 

 Rezbanya in Hungary, Freiburg in Brisgau, Altenberg near Aix-la- 

 Chapelle, near Tarnowitz in Silesia, at Olkuzk and Medziana Cora in 

 Poland and in Siberia, It occurs in Leicestershire, Derbyshire, Flint- 

 shire, Somersetshire, &c., in England; at Wanlockhead and Lead-Hills 

 in Scotland. 



In the United States, it has of late been discovered in Jefferson co. 

 (Missouri) at a lead mine called Valle's diggings, where it is associated 

 with Calamine. 



EMERALD. (See Beryl.] 

 EMERY. (See Corundum.) 



