MINERALOGY. 
219 
cum v/hicli contained copper and zink : But, how-p 
ever, it is not long fmce this femi-metal was difco- 
vered to lie concealed in calamine, and that cala- 
mine was its particular ore, and alfo a body of diC- 
tin6t qualities, prepared by nature, equal to that 
which is got tolerably pure at the furnaces of 
Gofllar, or that is imported from China, under 
the name of I’utanagiie. Mr. Brandt removed a 
great many doubts about the origin of zink, and the 
metallic earth of the calamine, by having, in the 
year 1734, a favourable opportunity of examining 
the calamines, and different kinds of blendes, from 
Rettwik in the province of Dalarne. He then 
proved, in his hiflory of the femi-metals, that 
blendes and calamines are ores of zink, and that 
the clear alum-like vitriol, called Galitzenjiein by 
the Germans, (Se6t. exxii.) was its vitriol. Soon 
after, the blueifh grey zink ore was difeovered 
by Mr. Von Swab at Bowallen, who in the year 
1738 prepared calamine from it, and ereded a work 
for diililling zink at large from it, at Wefterwiken 
in Dalarne ; which manufafture, however, after- 
wards was laid afide for other intervening bufinefs. 
Thus thefe firft difeoverers might perhaps have 
given Meffieurs Pott and Margraff the opportu- 
nity to write the hiflory of zink, then more 
knoWn to the world ; the former in his Treatife 
De Pfeudogalend^ in the year 174I'; and the lat^ 
ter in the Memoirs of the Academy of Berlin 5 
though this notice is by no means intended to 
prejudice thefe ingenious gentlemen of the ho- 
pour they merit, to have of themfelves had the 
fame opinion, and purpofed the fame experi- 
ments. 
The zink ore from Ramelfberg in the Hartz, 
is, like moil of the lead and copper ores from the 
kime mines^ of a very fine-grained texture s and 
it 
