EARTHS. SILICEOUS. 56. Chalcedonius. lyr 
Found in Cornwall, and the iflands of Scotland, in Iceland, 
Silejia, the Feroe ’Jlands, Saxony, and Siberia, in various ihapes, 
kidney (haped, ftalaitiiical, globular, botryoidal, like hollow 
pebbles often contriuing air bubbles or drops of water; alfo 
in angular pieces and veins in porphyry and amygdalitc, and 
fomctimes cubic : colour various fhades of grey, with lome- 
times a tinge of green or blue : luftre generally Icmitranlpa- 
rent rarely diaphanous: the lurtace is rough; frafture 
perferily even, ihouah fometimes paffing into the fine Iplin- 
tery or'iinperfedlly conchoidal: fpecific gravity from 2,586. 
to 2,655. contains fidca alumina mixed with iron 16. 
Bergman, 
Blue, of a flatter texture, fcniipellucid, of a common 
form, not falling Ipontaneoully into fragments. 
Found in the Ferce ijlandt, the fltorcs of Scotland, in Saxony, 
Bohemia, Hungary, and Tranjylvama : colour fometimes 
verging to cinereous or milky', fometimes clear Iky -blue, or 
between violet and lavender-blue, or lapphirine ; in other 
refperis it rel'emblcs the laft. 
’‘’&‘r. Black, dull red when oppofed to a flrong light, of a flatter 
texture, fomewhat diaphanous. 
H'.jjman, Berg. 'Jcurn. 1787, i. p. 283. 
Found near Chemnitz in Saxony, imbedded in Porphyry, 
■Arenj. Brown, of a texture fometimes flatter fometimes concho- 
idal, diaphanous. 
Carneolus fufeus. Wall. j)!l. \, p. 
Found detached at the xvitflom in Siberia, and near Chemniz in 
Saxony, imbedded inl'orphyry. 
^“‘eus. Pale yellow', of a flat texture verging to the conchoidal. 
Carneolus flavefeens. WalLfiji. i. p- 273. d. 
Found detached near the riter Torn in Siberia, and in Ceylon, 
Hangay, and Saxory: colour fometimes wine-yellow, fome- 
times wax or honey-yellow, 
^°’'neolus.. Blood- red, rcmitranfparent, of a perfe£lly conchoidal texture. 
Silex ruler. Syit. nat. xii. 3‘ p- 9 > 
Carneolus. Wall.fyst. i. p.zy^. n. 14. 
Carnelian. Schmet/ser i.p. 107 Kirwan i.p. 300. 
Coineliaii. Hhomfonchem- J /• 53 * • . . 
Found in Arabia and Hindojtan, Fgypt and various parts of A«- 
rope, generally in roundilli pieces, and alfo in layers in 
Agate t colour various fhades of red; rarely opake, and 
fometimes turbid with a few cloudy fhades outer furface 
rough and uheven, the fiagnients indeterminately angular 
and (liaip-cdged : fpecific gravity from 2,630. 102,700- 
