124 



EARTHS. ARGILLACEOUS. 35. Ardefij, 



solida^ 



(ompactis' 

 iima. 



afraia. 



4 

 5 



2, Rcddifh or brownifh-red. 



3. Of a purple colour, 



Reddiili-purple. 



Greenifh-grey. 



Found in msny mountains of Britainf and various parts of 

 Europe^ generally in layers, and frequently marked with the 

 impreffion of living bodies and pknts : when broken lliines 

 a little from a mixiure of micaceous particles or granulations 

 of quartz ; does not adhere to the tongue, or imbibe water, 

 and is principally ufed for the covering of houfcs,. 



Blackifh, of a compact ilaty texture, giving a clear found 

 when (truck, making a cinereous ih'eak. 

 Schiflus fcriptura cinerea. Syjl^nat. xii, 3./. 38. «. 6. 

 Schiftus (olidus durus. Wall. fyst. i p. 342. «. 7 ? 

 Found m is^a^eclen^ Spainy ?in6. Ns^jj Spain ^ of a fhivcry frafture, 

 and a blackifh, brown, grey, or rede ilh colour. 



Of a dull colour, very compa£l, and folld, hardilb, leav- 

 ing a whitifh ifreak. 

 Schiftus compact jfTimu 5. Syst, nat. xii. 3./). 39. «. iv 

 Found very rarely in Cki/^a-, black or brown, exteriorly glab- 

 rous and unequal, internally very compafl. 



Of a lamellar flaty texture, very foft, making a whitifh 

 ftreak. 



Schiitus fcriptura alba. Syst, nat. xii. 3. p. 37. «, 3. 

 Schiftus dive.'fo colore. WalU jyst. min, i. p. 341. ». 6. a. c e. 

 Found in Lapland^ and various provinces of S'-t.vtVf/; : mcagie, 

 b'ackifh, brown, or yellowifh, c:r?ck!ing when ftirrcd in the 

 fire, and running into a frothy Mnd. ofgiafs tn a greater de- 

 gree of heat, effcrvefcing a little with nitric acid when 

 powdered. 



Ufidulata, 



Black, of an undu^ately flaty texture. 



Schiftus carb ■nanus IV-^U fyst 1. p. 34*:. »• 9- d. 

 Found in FinLnd and yitntja, fom- times fofter avA melting into 

 porous llag-s, fomctinrics a little harder and mehing into a 

 folid glafs. 



hituminosa* Very foft, a little ereafy, cf a dull. colour, (hining when 

 rubbed, leaving a black (Ireak, of a itraight ilaty trx- 

 ture, breaking into difcoid fragments, fmoking or 

 flaming in the fire, becoming paler in the fire. 



Erandfchiefer. Cronli. -/nintr feci. 159. 



Bituminous ihifi us. SchmeiJJer minsral, i 



2. Schiilus folidas craflus. Wall fyst, i. p. 



3, Schiftus communis. Syjl. nat,. xii. 3. p, 

 Schiftus niger pinguis, JValLfyst^ i>p^ 



p. 170, 



344. ». 9 



39. «. 10. 

 340. ».5, 



b, c. 



