220 
SALTS, yr. Almneii. 
71. ALUMEN. Of a i'weetifh and very 
tafte; its watery folution made turbid by 
but not by pruffiate of lime: tumefying 
lofing its tranfpaiency when expofed to 
and becoming a Ipongy maf^ after lofing 
water of cryftallization. 
phosphoremn Flying to pieces when expofed to a violent heat, conr>ll'’’!» 
of phofphoric acid and alumina. 
Grenat de Valence. Prouft chem, anti. 1. 8 p. 196. 
Pccfphat of Alumina, nomfon chem. 2. p. 365. 
Found in f^alentia: a iallclcfs powder, not loluble in water- 
yields a gritty powder when diffolved in pliofphoric aci*!’ 
and a gummy loJution which is converted by heat in'-o * 
transparent glafs. It does not feem to belong to this genus- 
muriaticutn, Expofed to a violent heat, or moiftened with flrong f'd' 
phuric acid, emitting acrid grey vapours of a difagre*^' 
able odour. 
Found in l^ufcany, efHorefeing on the furr’ace of aluminous 
like powder, in dry ieafons, alfo in the mouths of c.ives ai'U 
fiffures of rocks with the appearance of wool or a white crulh 
its tafte is rather bitter than aftringerj:. 
nativum. Pure, dry, not emitting vapours when fulphuric acid 
poured on it. 
Alumen nudum. Syft. 7iat. xii. 3. p. 101. t. 
Alumen nativum. Wall.jyst. 2. p.32. n. t. 
Alum. Kirwanz. p.iT^. Schmeifser min. I.p. 270. 
Alum. T.homfon them. 2. p, 364. 
1. In the form of an efBorefeent powder. 
2. Of a common fornj, folid, without luftre. 
3. In a fialaflitical form, foliS, without luftre. 
4. Solid, of a filky luftre, fibrou.s internally. 
5. Cryftallized in a double 4-fided pyramid. 
Found in Egypt, the iflands of the Archipelago, Malta, Sicily. 
the craters of volcanos, the alps of Siviizet/and and the laf^’ 
of ’Tufeanp, and in various parts of Europe in aluminous Ihift • 
it is dillblved in 34 times its weight of cold water, and calilf 
forms cryftals which effiorefee a little in the air : when e*' 
poled to a ftrong heat it fublimer, fwells, foams, lofes 
tranfparency, and at laft lofes 44 per cent, of it weight : 
folution always turns vegetable blues red : fpcc iSc gravity 
1,7109. contains fulphate of alumina 49. fulphate of 
7. water 44. ■ Eau^uelint 
