3 1 4 Elements of Mineralogy. 



65 of the calx of zinc, 28 of aerial acid, 6 

 of water, and i of iron, and fometimes a 

 little of filex. 2 Bergm. De Mm. Zinci. 



5. Note, Mr. Bergman fufpedls the fub- 

 ftance called zinc fpar by Baron Born to be a 

 different fubftance. Mr. Bindheim found it 

 infoluble in acids before calcination, and in 

 the dry way infufible with the three ufual 

 fluxes, but after calcination it becomes fo- 

 luble in acids. 4 Berlin Scbriff* 399, 



II. VARIETY. 



Mixed ivith a notable Proportion of Iron. 

 Tutenago. 



6. Mr. Engejlroni) in the Memoirs of Stock- 

 holm for the year 1775* has given us an ana- 

 lyfis of an ore of this fort from China ; it 

 was of a white colour, interfperfed with red 

 ftreaks of calx of iron, and fo brittle as to 

 be eafily broken betwixt the fingers ; in the 

 dry way it exhibited the fame appearances as 

 the former Variety* except that it loft no part 

 of its weight ; it was foluble in the mineral 

 acids, particularly with the afTiftance of heat, 

 and with the vitriolic afforded vitriol both of 

 zinc and iron ; the quantity of fixed air was 

 fo fmall as to be abforbed by the folution ; it 

 contained ia various fpecimens from 60 to 90 



per 



