112 EARTHS. ARGILLACEOUS. 30. Alumin. 31. Argilli. 



ORDER IV. ARGILLACEOUS. 



fmiinja» 



Containing principally aluminous earth, 



30. ALUMINARIS. Confiding almoft entirelv of 

 alumina: meagre to the touch, light, without 

 luflre, earthy, adhering a little to the tongue, 

 ftaining a little: nearly foluble in nitric acid^ 

 contradting and hardening in the fire, emitting 

 fparks before the blow-pipe* 



Aluminaris. 



Native argill. KirnXian hiiner. I. p. 175. 



Native argillaceous earth. Schmeijjer miner, i, />, 159, 



Native alumina. Thomfon chem. 3. p, 502. 



Found in various parts of ^r/Vfl/zr, Mufco'vy, and Saxony y in kid- 

 ney-form mafl'ei. : fnow- white, very foft, breaking into inde- 

 terminate fragments, and does not readily diffufe itfelf in 

 water; 



^crcel/ana. 



ji. ARGILL A. Confiding of alumina and filicaj 

 with generally fome oxyde of iron and in- 

 flammable matter: opake, without luftre, of a 

 common form, foft to the touch, earthy, light- 

 i(h, foft, imbibing and retaining water and oil, 

 by each of which it is fofcened, and rendered 

 plaftic by the former, and emitting an earthy 

 tmell: not effervefcing with nitric acid, contradt- 

 ing and becoming harder in the fire. 



Meagre, white, friable, adhering to the tongue, becoming 

 white when burnt, and in a very flrong heat forming 

 porcelain. 

 Terra porccllana* Cr or st* miner, 78. A. 

 Argilla apyra. Wall.Jyst,min, i. p. ^i^ n, ^» 

 Porcelain clay. Kiruian miner. 1. ^. 178. 

 Porcelane clay. Schmeifier miner, i, p. 1 57* 

 Porcelain earth, ^homjon chemi 3. p. 534, 



Tn a conipacfl term. 



Argilla apvra. 



Ar^iila arvra. IVaH, min, 10* 



6y/r. nat, xii. 3. j5. 200, n,i. 



