112 EARTHS. ARGILLACEOUS. 30. Alumin. 31. Argilla. 
ORDER IV. ARGILLACEOUS. 
' Containing ■principally aluminous earth. 
30. ALUMINARIS. Confifting almoft entirelv of 
alumina: meagre to the touch, light, without 
luflre, earthy, adhering a little to the tongue, 
ftajning a little: nearly foluble in nitric acid, 
contrafting and hardening in the fire, emitting 
fparks before the blow-pipe. 
bati'va. Aluminaris. 
Native argill. Kir’W an miner. I. p- I 75 ' 
X Native argillaceou! earth. Schmeijjer miner, l, p.l 59. 
Native alumina. ‘Ihomfon chem. ’i- ■p. _ 
found in various parts of Britain.^ Mufconiy, and Saxony, in kid- 
ney-form malfes; fnovv- while, very foft, bre.iking into inde- 
terminate fragments, and does not readily diffufe itfelf in 
water. 
31. ARGILL A. Confining of alumina and filica, 
with generally fome oxyde of iron and in- 
flammable matter: opake, without luflre, of a 
common form, foft to the touch, earthy, light- 
ifl-i, foft, imbibing and retaining water and oil, 
by each of which it is foftened, and rendered 
plaftic by the former, and emitting an earthy 
(mell: not efiervefeing with nitric acid, contradt- 
ing and becoming harder in the fire. 
porcelIa,ti. Meagre, white, friable, adhering to the tongue, becoming 
white when burnt, and in a very Itrong heat forming 
porcelain. 
Terra porcellana. CronU.mir.tr. 78. A. 
Argilk apyra. Wall. Jyst. min. i. p. n. 
Porcelain clay. Kir-wan miner, i. p, 178. 
. Porcelane day. Schmei/ser miner, i. p. 
Porcelain earth. ’Tbomjhn them. 3. 534 ' 
1 . In a compafl ferm. 
Ai-gilla apyra. Slit. nat.-x.v. 3. p.zoo, i. 
Argiila apyra. Wall* min, 19, 
