PHYSIOGRAPHY. 95 



Calamine Calcareous Spar. 



1. Before the blow-pipe it loses its transparency, but is infusible ; the 

 ;arbonic acid is driven off, and the residue acts like pure oxide of zinc, 

 t is soluble in nitric acid with effervescence. It is negatively electrifi- 

 jd by friction. 



2. Analysis. 

 By SMITHSOX. 



Oxide of zinc .... 65-20 

 Carbonic acid .... 34-80 



3. Calamine is found, often associated with Electric Calamine, in 

 reins and beds belonging to various classes of rocks, but chiefly in those 

 ivhich are calcareous ; and they are usually accompanied by ores of 

 ead, copper, iron and zinc. 



4. It occurs in the Bannat of Temeswar in Hungary, at Raibel and 

 31eiberg in Carinthia, at Tarnowitz in Silesia, at Medziana in Poland, at 

 \ix la Chapelle ; also in France, and in Leicestershire, Derbyshire, 

 Flintshire, Somersetshire, in England, and at Wanlockhead and Lead 

 lills in Scotland. Calamine exists in the United States in .great abun- 

 iance, in Jefferson county, Missouri, at a lead mine called Valle's Dig- 

 gings. Other localities of this species less remarkable, are the Perkio- 

 nen lead mine, Pennsylvania, and the iron mine at Franklin, New Jer- 

 ?ey : at the latter place, however, it only occurs in a pulverulent form, 

 rom the decomposition of Red Zinc-Ore. 



CALCAREOUS HEAVY SPAR. 



This mineral, imperfectly distinguished by BREITHAUPT from 

 Heavy Spar, is described as follows : Crystals, right rhombic 

 prisms; surmounted by pyramids ; the lateral planes inclining un- 

 der angles of 101 53'. Cleavable parallel with the base with 

 great distinctness, and nearly as much so with the lateral faces of 

 the rhombic prism. Lustre pearly to vitreous. Sp. gr. = 4*02 

 . . . 4-29. Locality is not mentioned. 



CALCAREOUS SPAR. Rhombohedral Lime 



Haloide. MOHS. 

 Primary form. Rhomboid. P on P = 105 5'. 



