J:ARTHS. argillaceous. 41. Scorlus. 141 



nitric acid, and before the blowpipe melts into a bro'.vnilh 

 compaft enamel: fpecific gravity from 3»054. to 3,092. 

 contains alumina 41,25. filica 34,16. iron 20,00. manga- 

 nefe 5 ,4 1 . IVeigUb . 



2. In regular 1 2-rided cryftals, with the margins generally 

 truncate. 



Zeylanites, La Mefhiere Journ, P'yf. 1792. Jug. p. 156. 



Ceylanite. ^homfon cbem. '3^. p. '^\^. 



Pleonafte, Hauy min^r. 3. ^. 17. 



Found in Ceylon, fometimes in rounded mafle5,.generally opake, 

 except when in very thin pieces: frailure conchoidal : in- 

 ternal luftre g'affy : colour of the mafs black, of very thin 

 pieces green, red, duflcy yellow, or blueifti : powder green- 

 i(h-grey; fpecific gravity from 3,7647. to 3,793. contains 

 alumina 68. oxyde of iron 16. magnefia 12. filica 2. 

 De/cotils. 



leSricKs. When heated to 200° of Fahrenbeit, attra6ling light bodies 

 by one end, and repelling them by the other. 



Borax diaphanus. Syst nat. xii. 3. /. 72. n. 4 



Zeolite? facie vitrea. WalLfyli. min. i.p. 271. 



Tourmaline, Kirivan mineral. \.p. 271. 



Turmaiin from Zeylon. Schmeijfer mineral, I. p, 78. 



Ele6lric Shorl. Thom/bn chem. 3. p. 546. 



Found in the rivers of Ceylony in BrafJ, CaBiliaj the iflands on 

 the coaft of France^ Greenland, Nor<vuaVi S<weden, Sivifzerland, 

 and Gerynany, and near Freyburg in Saxony, in Granite, Gneifs, 

 and other fimilar rocks, fometimes in amorphous pieces, but 

 more frequently cryftallized in 3 or 9-fided prifms, with 4- 

 fided fummits, fometimes ingrains: colour generally green, 

 fometimes brown, red, or blue: cryftals 3. 6 or 9-fided 

 prifms, varioufly truncated, with the faces ufually longitu- 

 dinally ftriated : is laterally tranfparent, but not longitudi- 

 nally : fracture conchoidal, with often a tendency to the 

 foliated: is not readily aifted upon by acids: reddens when 

 heated, and melts v^ith difficulty into a white or grey enamel: 

 when heated to 200^ of Fahrenheit, is eleclric, attracting 

 light bodies by one end, and repelling them by the other ; 

 but if one end be heated and the other be cold, atirading 

 them at both ends: fpecific gravity from 3,05. to 3,155. 

 contains filica 40, alumina 39. oxydc of iron 12. lime 4,^ 

 oxyde of manganefe 2.5. Fauquelin,* 



