21 ^ 
SALTS. 69. Mirabile. 
feldom found pure, but ufually mixed with foda, common 
fait, Epfoni fait, or felenite: the fides of the cryftals arc 
commonly grooved, and when cxpofed to a warm atmofphere 
they fiKin lofe their tranfparency and water of cryfiallizationi 
and fall Mitt) a white opake powder; when expofed to heat it 
nrfl; melt?, and after the evaporation of its water becomes a 
white powder, and in a red heat melts. Its ufe as a cooling 
purgative is fuflicently known. Contains acid 27. foda 15. 
water 58. Bergman. 
^tasiinum. Of a bitierifli tafte, decrepitating when placed on hot coaW 
and melting in a red heat, foluble in 16 times its 
weight of cold water, its cryftals not mouldering in 
the air. 
Proiiji beytr. chem. aunal- 3. f. 406. 
Tartar vitriolate. Kirnvan miner. 2. p. 8. 
Sulphatof Potafs. Tkanjon chem. Z. p. 347, 
2, With an excels of ac:d. 
Superfulphat of Potii's. Thirnjlinchem. 1. p. 349. 
Found in various parts of Sficun, of a greyilh-white colour, and 
fometimes luminous in the dark : when its diluted folution is 
evaporated it affords 6-fided pyramids, or ihort hexangular 
prifins terminated by one or more hexangular pyramids: the 
the fuperfulplute of potafs ^rom its cxcefs of acid turns blue 
vegetable juices red, and is foluble in twice its weight of 
water. It was formerly u fed as a purgat under the name 
of Sal polychrejt and vitrioUted tartai . Specific gravity 
2,298 contains acid 40. potafs 52.- water of crylUilization 
S. Bergman, 
'“’Xireolatile Of art adrid tafte, evaporating in fumes when heated, de- 
liqnefcing in the air, emitting an alkalme odour when 
rubbed together with quicklime. 
Found rarely iu the vicinity of volcanic mountains. 
''‘kkureuvu Evaporating in fiimes when heated, deliquefcing in the air, 
\vhcn 'rubbed together with qr.icklime emitting an al- 
kaline odoiir, and when fprinkled with nitric acid an 
odour like burnt fulpiiur. 
Vitriolic ammoniac. Kirv-an miner. 2. p. 10. 
Sulphuric acid united to ammonia. Schmei/ser, l. p. 268. 
Sulphat of ammonia. ‘J.homfon chem. 2. p. 
Found in the neighbourhood of volcanos, in fome lakes in 
Tufeany, at the bottom of a burning well in Dauphigny, and 
on the furface of the earth near Turin, It is generally found 
• mixed with fulpihur, alumina, alum, or vitriol, and hence its 
VOL. VII, — Ee 
