Kin ah an — On Irish Metal Mining. 



209 



LEAD AND ZINC. 



[Except in a few localities the ores of zinc are accompanied by those of lead. In many 

 places are found more or less grouped together the sulphides of lead (galenite), zinc 

 (blende or sphalerite), and iron (pyrite or sulphur ore), and more seldom the sulphides 

 of copper (chal copy rite), arsenic (arsenopurite or mispickel), and antimony (stibnite), 

 with the sulphate of baryta (barite). The -lead ore is often argentiferous, and -in a 

 few places the copper ore. In some places are found the carbonates of lead (cencssite), 

 zinc (calamine), and copper (malachite), also the silicate of zinc (Smithsonite).'] 



SCIEN. PKOC. R.D.S. — VOL. V. PT. IV. 



