'itl 
SALTS. 71. Alumen. 
commune. 
^'ornid in Britain near Whithy, in Snvitzeriand, Tufeany, and 
La ‘lolfa near Rome, forming llrata or valt mafles, with ff®' 
quently fmall lumps of pyrites or fulphate of iron interfperled* 
and harirg fometimes veins of wljite quartz running through 
it: does not eflVrvefce with acids, is of a white, grey, 
laceous, or rofy colour, and produces alum upon combultio’’ 
or after long expofure to the air. 
Not emitting vapours when fiilphtirlc acid is poured up®’’’ 
it, mixed with bituminous Ihift. 
Alumen I'chilli. Syjl. nat. xii. 3. />. tot. «. z. 
Aluiiicn lapide fiffile mineral. Wall. 2. p. 35. ». 6, 
Agilla martialif, Cronli.mintr.fs 8 . 124. z. 3. 
Slaty and compact Alum ofts. Kirnvan miner. 2, p, ig. 
Aluminous earth. SchmeiJJer miner, l, p. 171, 
Alumina. Thomfon chem. i. p. 519. 
1. Very foft to the touch, meagre, breaking into trapezoid frag' 
ments. 
.Shift, aluminof. lamellof. Cronft. min. 124. 2. 3. i. 
Karft. magaz, Hehi. natur. 3. p. 204. 
Hojjm, Rergm.Journ, 1788. z. p. 550. 
2. Hardilh, fhining internally, undulately flaty, a little greafy 
the touch, breaking into indeterminate fragments. 
Schift. alurainar. undulat. Cronft. min. {2^. 2. 3. 2. 
Kdrft, magaz. Hein:, natur. 3. p. 203. 
Hoffm. Berg, Journ. 17SS. 2. p. 501. 
3. Slightly effervefeing with acids. 
Alum lapide calcareo. Wall.Jyst, 2. p. 35. n, 5. 
Found in the neiahbourhood of coal-mines in various parts 
England, Scotland, and IVales, in Siberia, Nor-zvay, Swede”’ 
many parts of Germany, &c. forming vaft mountains, and 
ftrata over coals and iron ore ; it is alio found in fmall flatted 
fphcrical malfes, containing fmall particles of fulphuret 0* 
iron in the form of pyrites : colour blaclt, gives a dark gr®/ 
ftreal, adheres a little to the tongue: texture Arty, foin®' 
times ftraight, fometimes curved, and has a fweetifti 
fomewhat aftringent tafte, and is apt to wither in the air inW 
a dull gr.y powder. It is ufed in alum works. 
fur/a. 
Not emitting vapours wlien fulphuric acid is poured iipo” 
it, mixed with turf. 
Alumen turfa mineralis. Wall.fyli. 2. p. 33. 
Swab A 8 .Stockh. z%. p.'!)'] . Kirwan min. z.p.ZQ. 
Found near Elfimlurg in Sweden, and in France, and conftfts Oj 
turf fo impregnated with fulphurpt of iron as to yield a to*' 
portion of alum, 
