SALTS. 71. Alumen, 



221 



Haloft'l- 

 chum* 



solutum. In a rtate of foludon, not emitting vapours when fiilphuric 

 acid is poured on it 



Rkhter chem annal. 1788 !. ;> 374 

 Found in many p^rtsof Siberia and Italy t 



Drv, fibrojjs, of a filky Inflrc, not deliquefcing in the 

 atmofphcrc, nor emitting vapours when iulphuric 

 acid is poured on it. 



ScopoL de Hydrarg^ Idricns. I 76.' . p. 68. 



Capillnry Al'uni. K-r^vati miver^z, p,!"^. 



Hair fait. Schmeij.er. mineral, I. p 270. 



Found in the quickfilver mines of Idriuj the lakes of Tufcany^ in 

 Italy i Sicily, HuKg-ryy and the coal-mines r\Qir PJ^hitelja^ven ; 

 the cryftals are tender capillary fiivery-white filaments, gene- 

 rally parallel and incurved, rarely difpoled in a itellate man.f 

 ner, which frequently adhere together and form compa'fl 

 pieces; thefe, alter expofure to the 'air, lofe their tr,.nrpa - 

 rency and become more or Icfs of a yellowifh or greeniili hue. 



hutyraceum. Of a yellow colour in its native foil, foft and fat to the 

 touch, hardening in the air and becoming white, of 

 a waxy luftre, lamellar. 

 Stone butter. Kirnvan mineral. 2. p^ 14, 

 Mountain butter. Schme^Jfer mineral, i. p. 271. 

 Found in Siberia and JJf^per Lnface^ oozing- from the fvirface of 

 • aluminous fnilt : it is a little fem'tr nlparcnt, loft and friabli--, 

 hut beccmes brittle by expofure to the air, and coniains de- 

 conipofed fulphate of ircn as well as alum. 



Combined with foft alumina, not emitting vapours when 

 fulphuric acid is poured on it. 



Alumen terra mineralis. Wall.f\it. 2. p. 23. n 3. 



Found in the vicinity of volcanic mountains, and in various 

 parts of the continent: colour rarely white, brown or black 

 when the earth with which it is combined is mixed wuh 

 bitumen, in which cafe it liames in the fire and gives out a 

 difagreeable odour like burnt peat: fomctimes it fpontane- 

 oufly hardens in the atmofphere and exhibits its aium in a 

 ftate of efSorefcence. 



terreum. 



romanum. 



Adhering to the tongue, foiling the fingers, not emitting 

 vapours when fulphuric acid is poured on it, combined 

 ■with indurated purer alumina. 



Alumen niarmoris. Syit. nat. xii. 3. />. 102. n, 3. 



Alumen lapide calcar. Wall./yst. 2. p. 34. n. 4. 



Aluminous ores. Kirtvan miner. 2. p. 15. 



Roman alum. Thomfonchem. 2. p- 364. 



Rock aluxn» Schmeijser miner. I. ^. i73». 



