124 
EARTHS. ARGILLACEOUS. 35. Ardella. 
2. Rcddilh or browniQi-rod. 
3. Of a purple colour, 
4. Reddiih-purple. 
5. Greenifh-grey. 
Found in many mountains of Briiain, and various parts nt 
Europe, generally in layers, and frequently marked with th® 
impreflion of living bodies and plants : when broken fninO 
a little from a mixture of micaceous particles or granulation* 
of quartz : does not adhere to the longue, or imbibe wateti 
and is principally ufed for the covciog of lioufes. 
solida, Blackilh, of a compadl flaty texture, giving a clear foiinti 
when (truck, making a cinereous (treak. 
Schiilus feriptura cineica. r.at. xii. 3 p. 3?. n. 6. 
Schillus folidus durus. Wall. fyst. i . p. 342 n. 7 ? 
Found in S^veden, Spain, and Avao Spain, of a fhivery fradlure* 
and a blackilh, brown, grey, or rcduiih colour. 
Of a dull colour, very compact, and folid, hardifh, leav- 
ing a whitifli flreak. 
Schillus coinpafliffimus. Syst. nat^ xii. 3. p. 39. n i 
Found very rarely in China-, black or brown, exteriorly glab' 
rous and unequal, internally very compafl. 
Of a lamellar flaty texture, very foft, making a whitil^* 
(treak. 
Schiltus feriptura alba. Syst. nat. xii. 3. p. 37. n. 3. 
Schillus diverfo colore. Wall, J^st. srin. 1 . ^. 341 . «. 6. a. c e. 
Found in Lapland, and viriou" provinces of Sni-eden : mcag 
blackilh, brown, or yellowidi, crickhng when ftirred in '''^ 
fire, and running into a frothy kind of g afs in a greater de- 
gree of heat, effervefeing a little with nitric acid wire*’ 
powdered , 
eosnpactis- 
sima. 
atrata. 
undulata. Black, of an undulately flaty texture, 
Schiltus carbonarius. Wall f'.'st r. p. 343. n. 9. d. 
Found in Finland and ’Jemtta, tomniines fofter and melting in^'’ 
porous flags, fometimes a little harder and meiting into* 
folid glafs. 
lituminosa. Very foft, a little greafy, of a dull colour, (hining wh«'^ 
rubbed, leaving a black flreak, of a (Iraight (laty t-S' 
tore, breaking into difeoid fragments, fmokiiig 
flaming in the fire, becoming paler in the fire. 
Erandfchiefer. Cronft. miner fea 159. 
Bituminous Ihiftus. Sch.teiffer mineral, i. p.i 70, 
2. Schillus folidus c.-afllis. Wall./vst.l. p. n. c. 
3, Schiflus communis. Syjl, na* xii. 3. p, 39. «. 10. 
Schillus niger pinguis. WalLjyst, 1. /. 340. n.^. 
