Zinc. 31$ 



per cent, of zinc ; the remainder was iroa 

 and a fmall proportion of argill. Mr. Bind- 

 heim alfo difcovered this Variety in Germany^ 

 and found it to confift of zinc, a little iron 

 and filex. 4 Eerh Schrifi. 400. 



III. VARIETY. 



Mixed ivith Iron and Clay in various Pro- 

 portions. 



Calamlne, 



7. Its colour is white, grey, yellow, brown 

 or red, not fo brittle as the 2d Variety, and 

 of various degrees of hardnefs, though 

 fcarce ever fo hard as to ftrike fire with fteel ; 

 its texture equable or cellular, and its form 

 either amorphous, cryftalized or ftaladitical ; 

 when calcined it lofes no part of its weight, 

 except it be mixed with charcoal, and then 

 flowers of zinc fublime ; it is foluble in acids, 

 and with the vitriolic affords vitriol of iron 

 as well as of zinc, which {hews the iron it 

 contains is not much dephlogifticated. The 

 fpecific gravity of the beft fort, that is, the 

 grey, is 5,000: 100 parts of this afforded 

 jidr, Bergman 84 of calx of zinc, 3 of iron, 

 i of argill, and 12 of filex; but in other 

 fpecimens thefe proportions are very different; 

 ores are fo poor as not to contain above 



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