URANOTANTAL. 



Uranotamtal, G. Rose. See Samars- 



KITE. 



Uranoxyd, Hausmann. See Uranite. 



Uranpecherz, Werner. See Pitch- 

 blende. 



Uranphyllit. See Uranite. 



Uranvitriol, John. See Johannite. 



Urao, Beudant. Native sesquicarbonate 

 Df soda, found at the bottom of a lake in 

 Macaraibo, a day's journey from Merida, in 

 Columbia. 



Urdite. See Monazite. 



UwAROWiTE, Kenngott A lime-chrome 

 Garnet, of an emerald -green colour. Lustre 

 vitreous. Translucent at the edges. Streak 

 greenish-white. H. 7"5. S.G. 3'4. 



Comp. CaSi+ (-G-rAl)Si. 

 Analysis, from Bissersk, b}^ Komonen : 

 Silica . . o . . 37-11 

 Oxide of chrome. . . 22 "54 



Alumina .... 5*88 



Lime SO'o-i 



Protoxide of iron, . . 2-44 

 Magnesia . , ' .1*10 

 Water 1 01 



100-42 



BB alone infusible ; with borax yields a 

 clear chrome-green glass. 



Localities. Kyschtimsk, and the mine of 

 Bissersk, in the Ural, in dodecahedral crys- 

 tals, with Chromic Iron. 



Name. After Uwarow, President of the 

 Imperial Academv of St, Petersburg. 



Brit, Mus., Case 36. 



M. P. G. Horse-shoe Case, No. 900. 



Valencianite, Breitliavpt. A variety of 

 Adularia, found at the Valenciana Mine, in 

 Mexico. 



Analysis, bv Plattner ; 



Silica .■" . . . . 66-82 

 Alumina .... 17-58 

 Peroxide of iron . , . 0-09 

 Potash , , • , . 14-80 



99-29 



Valentinite, Dana, Haidinger, Nicol. 

 Rhombic: cleavage perfect and easily ob- 

 tained. Occurs in acicular rhombic prisms, 

 and in rectangular plates with the lateral 

 edges bevelled, either attached singly or 

 arranged in fan-shaped, radiating or cellular 

 aggregations ; also massive with a lamellar, 

 columnar and granular structure. Colour 



YANADIATE OF LEAD. 395 



snow-white and ash-grey to brownish, rarely 

 peach-blossom-red. Translucent to sub- 

 transparent. Lustre adamantine, often 

 pearl V. Streak white. Sectile. H. 2-5 to 3, 

 S.G, 5-56. 



Fig. 447. 



Comp. Antimonic oxide, or Sb = antimony 

 84-31, oxygen 15-69=100. 



Analysis, from Wolfach, by Suchow : 

 Oxide of antimony , , 91-7 



Peroxide of iron . . ,1-2 



Silica 0-8 



Antimony . . . ,6-3 



100-0 

 Turns yellow every time it is heated, and 

 fuses in the flame of a candle, forming a 

 j^ellowish or greyish liquid, which on cooling 

 solidiiies to a white asbestos-like mass, 

 having a silky lustre. 



BB volatilizes, covering the charcoal with 

 a white coating. 



Localities. Przibram, in Bohemia, in 

 tabular crystals. Braunsdorf, in Saxony, 

 VVolfsberg, in the Harz. Horhausen, in 

 Nassau. Malaczka, in Hungary. Baden. 

 Nertchinsk, in Siberia. Allemont, in Dau- 

 phiny. 



Name. In honour of Basilius Valentinus, 



Valentinite occurs in veins traversing 



primary rocks, with other ores of antimony 



(of the alteration of which it is a result), 



Galena and Blende. 



Brit. Mus., Case 38. 



Vanadate of Copper (Cu7). Of a 

 citron-yellow colour, and with a foliated 

 structure, is said to occur, either reniform or 

 pulverulent, at Wosskressensk, in the Ural, 



Vanadate of Lead and Copper. Is 

 described by Domeyko as occurring in an 

 ejirthy state, in cavities in an arseno-phos- 

 phate of lead, at the Mina Grande silver 

 mine, or the Mina de la Marqueza, in Chili, 

 It is of a dark brown or brownish -black 

 colour, and resembles a ferruginous clay or 

 earth in appearance. 



Comp. (Pb6V + Cu6V). 



A similar ore is reported to be met with 

 at the Cliff Mine, in the copper region of 

 Lake Superior, in North America. 



Brit. Mus., Case 38. 



Vanadiate of Lead, Phillips. Vana- 

 dinbleikrz, Mohs. Vanadinitk, Dana, 

 Nicol. Hexagonal. Occurs in small and 

 indistinct hexagonal prisms; generally in 



