EARTHS. SILICEOUS. 56. Chalcedonius. 17 r 





Found in Comivall, and the iflands of Scot/and^ in Iceland, 

 Sile/roy the Ferce ^Jlandsi Saxony, and Siberia, in various fliapes, 

 kidney fliaped, ilaladitical, globular, botryoidal, like hollow 

 pebbles often condining air bubbles or drops of water; alfo 

 in angular pieces and veins in porphyry and amygdalitc, and 

 fomciinies cubic : colour various fliadcs of grey, with lome- 

 timcs a tinge of green or blue : luftre generally fcmitranfpa- 

 rent rarely cli .iphiinous : the furface is rough; fratture 

 perfeiftly even, though fometimes pafiing into the fine fplin- 

 tery or iniperfedlly conchoidal : fpecific gravity trom 2,586. 

 to 2,655. contains lilica d.i. alumina mixed with iron 16. 

 Bergman, 



cairuleus. Blue, of a flatter texture, femipellucid, of a common 

 form, not falling fpontancouily into fragments. 

 Found in the Verce ijlands, the fhores of Scotland, in Saxony, 

 Bohemia, IJungaiy^ and Tranjylvania : colour f^metimes 

 verging to cinereous or milky, fometimes clear fky -blue, or 

 between violet and lavender-blue, or liipphirine : in other 

 refpeds it refembies the laft. 



Black, dull red when oppofed to a ftrong light, of a flatter 

 texture, fomewhat diaphanous. 

 Hnjjman. Berg_ Journ. I 787. 1. />. 283. 

 Found near Chemnitz in Saxeny, imbedded in Porphyry, 



fuscus. Brown, of a texture fometimes flatter foinetimes concho- 

 idal, diaphanous 

 Carneolus fufcus. IValL/y/i. \. p. 274.6. 



Found detached at the r'wtrTom m Siberia^ and near Chemniz in 

 Saxony, imbedded in I'orphyry. 



lu*euf. P^le yellow, of a flat texture verging to the conchoidal. 



•Carnei lus flavefcens. WuU.fifi. i./>. 273. d. 



Found detached near the riier Tom in Siberia, and in Ceylon^ 

 Hunga>y, and Saxo>y: colour fometimes wine-yellow, fome- 

 times wax or honey^yellow. 



Carneolus, Blood-red", fcmitranfparent, of a perfectly conchoidal texture. 



Silex ruber. Syst. nat. xii. 3, p. 69, ». 9, 



Carneolus. Wall./yst. i. /. 273. n. 14. 



Carnelian. Schme-jser \. p. 107 Kirnxan \. p* 300. 



Cornelian. Thomfin chem. % /• 531. 



Found in Jrahia and Bindoftan, Egypt and various parts of £«- 

 rope, generally in roundidi pieces, ^ and alfo in layers in 

 Agate: colour various fhades of red; rarely opake, and 

 fometimes turbid with a few cloudy fhades : outer furface 

 rough and uneven, the fiagments indeterminately angular 

 . and fliaip edged: fpecific gravity from 2,630. 102,700. 



y 2 



