TJNCLEAVABLE SPAR. 



Silica 13 



Alumina .... 5 

 Water 14 



100 



The principal British localities are near 

 CastletOAvn, in the Isle of Man. Fine pig- 

 ments of various shades of brown and purple 

 are also obtained from Umber found at the 

 iron mines in the Forest of Dean. 



Brit. Mus., Case 16. 



Uk'cleavable Adiaphane Spar, 3Iohs. 

 See Nephrite. 



Uncleatable Azure Spar, Jlohs. See 

 Turquoise. 



Ukcleavable Iron Ore, Shepard. See 



MOHSITE. 



IJjSrCLEATABLE MANGANESE OrE, Mohs. 



See Psilomelane. 



Uncleavarle Nephrite Spar, Hai- 

 dinger. See Nephrite. 



Uncleavable Quartz, 3Iohs. See 

 Opal. 



Uncleavable Eetin- allophane, 3Iohs. 

 See PirTiciTE. 



Uncleavable Staph yline Malachite, 

 Mohs See Chrysocolla. 



Uncleavable Uranium Ore, Mohs. 

 See Pitchblende, 



Ungwarite, Glocker. A name given to 

 Chloropal, after the locality, Unghwar, in 

 Hungary. 



Uniaxial Mica. See Biotite. 



Unionite, Sillimann, Jr. A mineral re- 

 sembling Soda-Spodumene in general ap- 

 pearance, and proved by the analyses of 

 Smith & Brush to be a white Limt -Epidote. 

 Colour white. Lustre vitreous. H. 6. S.G. 

 3'299. Very distinct cleavage in one di- 

 rection. ••' 



Comp. PvSi + AlSi2 







Analysis, by Smith Sf 

 Silica . 



Brush : 



. 40-61 



Alumina 





. 33-44 



Peroxide of iron . 





. 0-49 



Lime . 





. 24-13 



Magnesia 



Loss by ignition . 





. trace 



. 2-22 



100-89 



Named after the locality^ Unionville, in 

 Pennsylvania, where it occurs with Euphyl- 

 lite, at the Corundum locality. 



Uraconise, Beudant. See Zippeite. 



Uralite, G. Rose. A pseudomorphous 

 mineral of a dark green or greenish-black 

 colour, with the cleavage and composition 

 of Hornblende, and the external form of 

 Augite. 



URANGREEN. 



393 



Analysis, from the shores 



of the Baltic Sea, 



by Kudernatsch : 







Silica . 





. 53-05 



Protoxide of iron . 





. 16-37 



Magnesia . 





. 12-90 



Lime . 





. 12-47 



Alumina 





. 4-56 



99-35 

 Localities. The Ural (where it was first 

 observed), in augite-porphyry. In the 

 augitic rocks of the Veltlin, of the East and 

 West Indies, of America, and at Arendal. 



Uralite is considered by Gustave Rose to 

 be a pseudomorph of Hornblende, after 

 Augite ; b}' others it is regarded rather as 

 an intimate admixture of those minerals in 

 indefinite proportions. 



Uralorthite, Hermann. A variety of 

 Orthite, found associated with small crj'S- 

 tals of Zircon, in the flesh-coloured Felspar 

 of Miask, in the Ural. S.G. 3-41 to 3-6. 



Comp. R2 bi + it Si + H. 

 Analysis, from the Ilmen Mountains, by 

 Hermann : 



Silica 35-49 



Alumina 



. 18 21 



Protoxide of iron , 



. 13-03 



Protoxide of cerium 



. 10-85 



Lime . 



. 9-25 



Magnesia 



. 2-06 



Peroxide of manganese 



. 2-37 



Protoxide of lanthaniu 



m . 6-54 



Water . . . 



. 2-00 



99-80 



BB intumesces and fuses at the edges to 

 a black blebby glass. 



Dissolves in acids — somewhat gelatinis- 

 ing. 



Brit. Mus., Case 38. 



Uranate de Chaux. See Uranite. 



Uranbloom ; UranblUthe, Zippe. See 

 Zippeite. 



Uranchalzit. See Urangreen. 



Urane Micace, Brochant, \ See 



Urane Oxide, Haiiy. j Uranite. 



Urane Oxide Terreux, Haiiy. Uran 

 Ochre. See Zippeite. 



Urane Oxydule, Haiiy. See Pitch- 

 blende, 



Urane Phosphate. See Uranite. 



Urane Sulfate, Necker. See Johanx- 

 ite. 



Uranerz, Karsten. See Johannite. 



Uranglimmer, Werner. See Uranite 

 and Chalcolite. 



Urangreen, Ur.vngrdn, Hartmann. A 

 basal sulphate of the oxides of copper and 



