EARTHS. SILICEOUS. 56. Chakedoniits. 
m 
‘nUatUius, Precipitated from water highly charged with iis par- 
ticles. 
1. Inclofing or incrulVmg Lichens and other vegetable fubflances. 
2. Inclofing or incrulling cryftals, and hence having the appear- 
ance of cryftals. 
3. In knotty hollow kidney-form or botryoidal globular pieces. 
4. In folid or hollow cylinders. 
Found in the Feroe ijlanas, Iceland, Bohemia, Saxony, and many 
otlier parts of the continent : texture fometimes approaching 
to the fibrous. 
^’^y>taUinus. Blucifli, in the form of 6 (idcd divergent prifins. 
Ftchtel 'von Karpafb p. 138. _ 
Found in a valley near Tatar ejchel in Tran/yhania, imbeddea 
in yellow jafper, 
^tridis. Green, femitranfparent, of :i flatter texture. ' 
Found, though rarely, in the Feree iJJanJs: colour generally 
' grafs-green, though fometimes approaching to the leruginous. 
^^rysopra- Green, with hardly any inlevnal liiftre, fcmiiranfparcnt, 
'“■f. of a flatter texture. 
Nitrum fluor. Syfl. nat. xii. 3. p. 85. ». 3. g. 
Achates prafius. Wall Jyst. i. p. 262. 
Chryfopralium. Kir-man miner. 1. p. 283. 
Chryfopras. Jameif. min. 1. /. 191. 
Chryfoprafe. Ihom/on chem. 3. p. 51 8. Sehnirifer i, p. 113. 
Found in Germany, paiticularly near Kc/emiitz in Silelia, in 
Bohemia and We/lphalia, generally in folid mall s, fometimes 
in loofe pebbles, or layers of afbe-fl, talc, litlioniarg. and iron 
ochre ; internally it is dull ; is hard, but docs not ftrike fire 
with ftcel : colour various fliades of apple-green, rarely grafs, 
leek or olive-green, very rarely grcenilh-grey or marked with 
brown fpots: in a heat of 130° of wedgewood it whitens and 
becomes opakc, but does not melt before the blowpipe; 
fpecific gravity 3,zsrj* contains ftlica 96,16. oxide of nickel 
j,oo. limeo,83. alumina 0,08. oxyde of iron o,S. Kiaproth. 
^^fliotropU Diaphanous, of a conchoidal texture, green marlced with 
opake blood-red dots and drops, 
Jafpis Heliotropius. Wall. /yd. i. p- 300, ». 2. g. 
Heliotrop. Blood- fteme. Schmeij er mineral, i , 1 16. 
Heliotropiuin. Kirwan mineral, i . p. 314. 
Heliotrope. Jameif. 1 . p. 187. Fhotnfon chem. i.p- 531. 
Found in Jfia, Prrfta, Siberia, Iceland, Bohemia, and Francor.iai 
in rocks of trap; colour various (hades of green, fomctiines 
marked with ocliraceous fpots or lines : texture more or Icfs 
pcr.kflly conchoidal ; fpecific gravity from 2,62c. to 2,700,, 
