EARTHS, argillaceous, 31. Argilla. 119 
S(imew!iat meagre, a little plalUc when moiftened, dudy 
when dry, mcliing into folid glafs m the hre. 
Calx palullris Syfl. nat, xii. 3 p. 207. n. J. 
AreilU vix coherens. Wail, fy ft. i./ Oi n >4- 
Found in ■VcufrffB, chieiiy und.r bugs and marllies, grey or 
white ; the latter is uied for whitening walls. 
Cinereous, forming ftriall clods when moiftened, fplitting 
into large clefts while diying and becoming at lalt 
powdery, vitrifying jn the fire. 
Argilla homo niixta.^ Wall JyJi. i . p- SS- "• * '• 
Found every where in cultivated lands. 
^^mhra. Penetrated with bitumen, brown, making a mark, grow- 
ing redtlilh when burnt, 
Argilla humofa. Syd. nat'. xii. 3, p- 204. n 18. 
Humus colorata. Wall.Jyjl. min. \,p. 17. ». 3. 
Umber. Kirwan mineral, l. p- 197. , 
Martial clay. SchmeiJJer m neral. l. /. 164, 
Found rn Britain, Italy, Germany, &c. and is ufed by painters ; 
colour brown or blackifli, adheres to the tongue, and mode- 
rately ftains the lingers ; confifts principally of p.irtscles of 
decayed wood mixed with bitumen. 
’'■'‘^rioiacea. Brown, ftiptic, turning a decoftion of galls black. 
Argilla mixta fufea. Syji. nat xii. 3. /. 205. n. 21 . 
Found every where under boggy land, and is a mixture of clay 
and pyrites. 
Of a falt tallc. 
JJiaerne tentamen them. 1. 
Born, ind.fofs. 2. p. 98. ... c c 
Found in the maritime parts qI Aufiria, and in the conhnes otr 
fait pits, cinereous or red, and is impregnated with muriate- 
of loda. 
Black, forming a blue glafs when melted with borax. 
Gefn. Hist. Cobalt. \ . p.z\. 35. 
Found in the mines of Wirtemburg. 
^"W’fera, Brown, producing a blue colour with heated fpirit of am- 
moma. 
Born, brief, y. P 33, 34. 8. /. 43. r • 
Found in the mines of Germany i contains the, oxydes ol iron' 
and copper, in the proportion of about 26 per cent, of the 
latter. 
‘‘^Sentifera. Soft, plaftic, exhibiting filver when fufed with lead. 
Born, ind.fofs. \ . p. 83. 84. 
Berber id . die Gehirg, Vngar. f. "jy. ' 
