140 EARTHS. ARGILLACEOUS. 4i.Scorlus, 



faces generally ftreaked longitudinally, except where trun- 

 cated : fpccific gravity 3,2956, contains lilica 52.7. alu- 

 mina 25,6. lime 9,4. oxyde of iron 9,6. with a fmall tr-ice 

 of manganefe. Klaproth, 



iahularis» Hoary, femi pellucid, confiding of very thin 4-fided tables 

 compa£led into thicker ones. 

 Hoffmann Berg. Journ. 1788. \,p. 57, 



Found near Boiirg de Oifavs in Dauphine, with the lafl fpecies : 

 compa(fl:, a little poliflied, and fomewhat fhining internally, 

 of a rather plane texture : the lateral faces of the tables cy- 

 lindrico-concave, the terminal ones generally flightly con- 

 vex. 



<;/f.faa;;«»w. Diaphanous, fulvous, in 6-fided prifniatic cryftals. 



Hyacinthine, La Meiherie Journ. phyf. ijqz. Nonj, p. ■^!^6. 



Vefuvian. Thomfon che?n. 3.^. 599. 



Found fcatteredly in the lav^i;* of Feju^viusy and was formerly 

 confounded with the Hyacinth: colour fulvous-brown or 

 greenilh: is fometimes found cryftallized in reflanguiar 8- 

 fided prifms, or rather 4.fided prifms with their cd^es trun- 

 cate: the primitive form of its cryftals is the cube: Icratches 

 glafs: internal luftre 2, greafy ; external 4, gl a ify : fradlure 

 imperfeftly conchoidal : caufes double refraction : melts be- 

 fore the blowpipe into a yellowilh glafs: fpecific gravity 

 from 3,39. to 3,409. contains lilica 26,5, magnefia 40,2. 

 oxyde of iron 1 6j 2, lime 16,0. Stucke. 



g(nuinus. Ponderous, opake, making a pale grey fcratch. 



Borax lapidofus. SyH. nat. xii. 3. />. 95> ». 3« 



Corneus cryftallizatus. Wall, min.fp. 139. 



Bafalt. fig. column. Wall fyst, \.p. 319. w. 2, 



Shorl. Kir^vjan. mineral, i./. 265. 



Turmalin from Brafil. Schmeijer mineral, i. p, 78. 



Black Shorl. 'Thomf. chem. 3. p. 545. 



Found in Corn<vjall^ where it is known under the name of 

 Cockle i in Ceylon, Madagafcar, Spain ^ Italy, Siuitzerland, 

 France, Hungary, Saxony, Sec. in mafs, diffeminated and 

 cryftallifed, generally in Granite, Gneifs, and other limilar 

 rocks : the cryltals are 3 or 9 fided prifms, which when entire 

 are terminated by 3 fided pyramids; the furface of the cryf- 

 tala longitudinally Ilreaked : the amorphous kind prefents 

 th n ftraigUt diftintt columnar concretions, fometimes pa- 

 rallel, fometimes divergent or llellate, Ilreaked, a':d ealily 

 feparable from each other j very feldom in granular concre- 

 tions : the furface can be fcr tched with a hard knife, and 

 when heated or rubbed hard is a little electric : *vhcn heated 

 to rednefs it becomes rcddifh-brown : is often fo rich in 

 iron, as to be attracted by the magnet : is afted upon by 



