16 Mr. Smithson's chemical Analysis 
It was tinged, exteriorly, brown ; but its interior colour was 
a greenish yellow. 
It had considerable hardness ; it admitted however of being 
scraped by a knife to a white powder. 
56. 8 grs. of it displaced 13.1 grs. of water, at a temperature 
of 65° Fahrenheit. Hence its density =4.336. 
b. Exposed to the blowpipe, it became opaque, more yellow, 
and friable ; spread flowers on the coal, and consequently vola- 
tilized, but not with the rapidity of the foregoing kind from 
Bleyberg. 
It dissolved in borax and microcosmic salt, with effervescence, 
yielding colourless glasses. Carbonate of soda had no action 
on it. 
c. It dissolved in vitriolic acid with a brisk effervescence; 
and 67.9 grs. of it emitted 24.5 grs. = 0.360, of carbonic acid. 
This solution was colourless ; and no residuum was left. By 
evaporation, it afforded only vitriol of zinc, in pure limpid crystals. 
d. 23.0 grs. in small bits, made red hot in a covered tobacco- 
pipe, lost 8.1 grs. = 0.352. It then dissolved slowly and diffi- 
cultly in vitriolic acid, without any emission of carbonic acid ; 
and, on gently exhaling the solution, and heating the salt ob- 
tained, till the expulsion of all superabundant vitriolic acid and 
all water, 29.8 grs. of arid vitriol of zinc were obtained. This 
dry salt was wholly soluble again in water ; and solution of pure 
martial prussiate of soda occasioned a white precipitate in it. 
This calamine hence consists of, 
Carbonic acid - - - 0.352 
Calx of zinc - . - 0.648 
1.000. 
