1^8 EARTHS. SILICEOUS. 50. Circonius. 51. Amarus. 



50. CIRCONIUS. Confiding of filica, a more 

 than double proportion of circonia, and a very 

 fmall quantity of nnetallic oxyde, partly of iron 

 partly of nickel: very hard, ponderous, imitat- 

 ing the diamond in its lulirc, parafitical, foliated 

 with the foliations incurved, ciyftallized: not 

 fufible per fe. 



xeylanicus, CiRCONIUS. 



J a rgo n . Kir^cvan mineral, l, p. 333. 

 Zircon, Jargon. Schmeifser tniner. i, p. ^6, 

 Zircon, Jargon, ^homjon chem, l, p^ 525. 



found in Ceylon^ in fmall irregular grains, or cryftallized in 4- 

 iided rectangular prifijis terminated each fide by a 4-fided 

 pyramid, or in double 4-fided pyramids: colour grey, 

 greenifli, yellowifli-Srown, rcddifh-brcvn or violet; is 

 ftrongly femitraniparenr, fometimes opake : it fcratches 

 glafs, and is not altered by the heat in which the diamond is 

 confumed : fpecific gravity 4,416. contains zirconia 68,0, 

 filica 31,5. nickel and iron 0,5. Klaproth. 



51. AMARUS. Confiding of filica, a fmaller 

 proportion of magnefia, a very fmall quantity of 

 alumina and carbonate of lime, and lo per cent, 

 of oxyde of iron : hard, cenacious, fubopake, a 

 little greafy, green, of a fplintery texture, break- 

 ing into indeterminate fragments, of a common 

 form : not fufible per fe. 



uma%onicui» Amarus. 



Hoepfner magax. Natur. Helvet, I. p. z^^t 

 JaCpis unicoior. Wall, Jyji, mhi. i. p. 302. n, 4. 



Found in the Eaftj NewZealand^ and the Helvetic ■'indi Suhaudic 

 mountains, fomedme.s detached, fometime: forming vail 

 mafies : colour green with a call of blue, and in the promir 

 nent point of the fragments inclining to milk-white, ^y the 

 inhabitants of the Eaft and New Zealand it is fafhioned into 

 various ornaments, velTels and arms; 



