3<to METALS. 98. Uranium. 



.98. URANIUM. Dark-grey indining internally 

 to brown, with a (light luftrCj foft, brittle: fpe- 

 cific gravity 6,440: hardly fufible before the 

 blowpipe, but with borax forming a brown and 

 with micro( ofmic <alt a grafs-green glafs : con- 

 vertible into a yellow oxyde by the nitric acid, 



cchraceum^ Yellowifli or green, of an earthy texture, entirely foluble 



in nitric acid, combined with a large portion of ox- 

 ygene. 



Uranues. Klapifofh chem, avnah 1789. 2. ^.403. 

 Uranitic ochre, Kir 'zv an mineral z. p 303. 

 E^rthv oxvde of uranit. Schmeifser miner, z. p. 276, 

 Yellow oxyde of uranium, Thomfon chem, 4. p. 119. 



Generally found on the kirfac* of Uranium fulphureura or 

 Pechblende in Corn^'jall^ Sec. of a lemon or brimftone yel- 

 low or green: it flighily llains the fingers, is meagre to the 

 touch, hardly fufible before the blowpipe, but in a ftrong 

 heat becomes black : fpecific gravity 3,243 : confifts of ox- 

 yde of uranium and oxygene. 



Chalcoli' Hardilh, diaphanous, fhining internally, of a foliated tex- 

 thus^ ture, entirely foluble in nitric acid. 



Uranires fpaihofus. Klapr. chem annal. i 789. 2. ^. 403, 

 Chalcolit. Werner Bergm J Qurn 1789. 1 ./>. 376. 

 Micaceous uranitic ore. Kir njo an miner ^ 2./, 304. 

 Spatous uranit. Schmej fur miner. 2. p. 276. 

 Cryilallizcd oxyde of Uranium. Thonijon ^^ p, i\^. 

 Oxide of Uranite, Sonxjerby Brit, min. t, 125, 



Found in Ccrnivall^ near Eibenftock and "Johanrigeorgennadt in 

 ! Saxony ^ and near Rheinbreidenbach'm the eletlorate of Tm-x-o, 



fomeiimes on the furface of other ore«, fometimes in larger or 

 ^ lefs parucles mixed with rocks of gneifs, garnet or quaitz, 



.^ moft commonly cryftallized in cubes, Iquare plates, 8.fided 



or 6-fided prifms: colour emerald or grafs green, often in- 

 clining to filvery-white or yellowifh, with a greenifh-white 

 itreak : luftre fometimes perlaceous, fometimes metallic : tex- 

 ture foliated, brittle; foluble in nitric acid without effer- 

 vefcence, hut infoluble and infufible by alkalies: confifts of 

 oxyde of U'anium, carbonic acid, and the green kind a little 

 ,o,^yde of copper. 





