EARTHS, argillaceous. 31, Argilla. 
Very foft, rather meagre and dry to the touch, adhering ^ 
little to the tongue, of a (laty textute, breaking int^’ 
difcoid fragments. 
Schiftus argillaceous. S^st. nat. xii. 3. p 3S. n. 7. 
Argilla vitrcf, iiffil. Walt.Jjjl. tmn. 1. 45, n. 4. 
3 hilt,)fe cisy. Kiriuan mineral- I. p- 182. 
Slaty clay. Scbmeifier miner, 1. p, 168. 
Shiltofe clay. Thomfon chem. 3. p. 536. 
Found in Britain and various parts of Europe, in large layer.'; 
generally over and under veins ot coal, and is frequently pe- 
netrated with bitumen: colour black or grey, rarely bh'V' 
lometimes yellowiflu reddllh or brown, when it contain* 
much bitumen is of a blackiili-brown colour, appears W'® 
bad coal, and burns with a weak flame and fulpliure ms linell- 
frequently bears the iinpreflion of plants, cfpccially thofe u* 
the equifetum, adianthum and fern tribe: gives a whitilh or 
grey ftreak, and moulders gradually in water. 
Somewhat meagre, lamellar, white when dry, growing 
reddifh and hardening a little in the fire, melting in ? 
greater degree of heat. 
Argilla mixta. Syr/, nat xii. 3 p. 203. n. 14. 
Argilla fiflilis alba. Wall fyst, \ p. n. a. 
Found in the barren plains of Sutlermannia in Snxeden, efpecial'f 
where birch trees flourilh, and forms entire flrata alternating 
with beds of fand. 
Greafy, foft, fhining by friiSlion, adhering a little to the 
tongue, plaftic, growing reddifh and bliiterv in tli" 
fire 
Found in Tranjylvania, 
Greafy, fhining by fridlion, diffolving in the mouth; 
crumbling into powder immediately in water, grovV' ! 
ing reddiih and eafily diffolving in the fire, of a cou- 
choidal texture. 
Argilla ore liquefeens. Sju/. »a/. xii. 3 /. 203. ». 13. 
Argilla vitrefeens. Wall. fytt. min. 1. p 49. b1 8. 
Bolus. Cronft. min. 86. l^cgel min. p. 36. 
Bole. Kimuan mineral 1. p. I go. 
Bole. Schmet/ser mineral. \ p 165. Thomfon cbeni, I- p 5S7- 
2. Odorous earth from Portugal. 
Found in Armenia, Italy, France, and Germany, and is frequent' 
]y produced from decayed lavas: colour generally dull red 
brown, fometimes yellow, flefli.colour, cinereous, and in inn"' 
merable varictie.s; near Idria in Carniola, it is found 
with cinnabar, and near Kafnick in Hungary, combined "it 
filyer. 
