VOLTAITE. 

 Analysis, by Hermann ; 



Magnesia . 



Alumina 



Water 



102-89 



BB infusible, but exfoliates slightly and 

 gives out light. 



Locality. The mines of Schischimskaja 

 Gora, in the Ural ; on talcose schist. 



Name. In honour of Volkner, Director 

 of Mines at Katherinenburg. 



VoLTAiTE, Scacchi, Dana. Occurs in 

 cubes, octahedrons, dodecahedrons, and their 

 modifications. Colour dull oil-green to 

 brown or black. Opaque. Lustre resinous. 

 Streak greyish-green. 



Comp. Fe S + ¥e S^ + 24H. 



Dissolves in water, but with difficulty, 

 and at the same time decomposes. 



Localities. The Solfatara, near Naples. 

 The Eammelsberg Mine, near Goslar, in 

 Hanover. 



Name. After^the Italian physician, A. 

 Volta. 



VoLTZiNE, Fournet, 3Iohs, Nicol. VoLTZ- 

 ITE, Dana. Occurs in small hemispheri(;al 

 incrustations, with a thin curved-lamellar 

 structure. Colour dirty rose-red, inclining 

 to yellowish or brown. Opaque or slightly 

 translucent Lustre vitreo-resinous ; pearly 

 on surfaces of cleavage. Fracture con- 

 choidal. H. 4-5. S.G. 3-66. 



Comp. Oxy-sulphide of zinc, or 4Zn S + 



Zn = sulphide of zinc 82*7, oxide of zinc 

 17-3 = 100. 



BB behaves like Blende. 



Localities. Rozieres, near Pont Gibaud, in 

 Auvergne. Elias Mine, near Joachimsthal, 

 in Bohemia. 



Name. After Mons. Voltz, French min- 

 ing engineer. 



VoRAULiTE. A variety of Lazulite, found 

 in a gangue of Quartz, at Waldbach Yorau, 

 in Styria. 



VoRHAusERiTE. The name given by 

 Kenngott to a mineral from the Fleims 

 Valley, in the T\ rol, with the composition 

 of Eetinalite, but rendered impure by a 

 slight admixture of the oxides of manganese 

 and iron. It occurs amorphous. Colour 

 brown to greenish-black, with a weak waxy 

 lustre. Streak pale or brownish-yellow to 

 brownish. H. 3-5. S.G. 2-45. 



Name. In honour of the Tyrolese mi- 

 nister, Yorhauser. 



YosGiTE. The name given by Delesse to 



WAD. 401 



a Labradorite, wihch has been rendered 

 hydrous by partial alteration. It is of a 

 whitish colour, sometimes with a shade of 

 green or blue, and has a pearly or greasy 

 lustre. S.G. 2-77. 

 Analysis, by Delesse : 



Silica 49-32 



Alumina .... 30-07 

 Peroxide of iron . . . 0-70 

 Protoxide of manganese . 0-60 



Lime 4-25 



Magnesia .... 1*96 



Soda 4-85 



Potash 4-45 



Water 3-15 



99-35 

 Locality and Name. It constitutes the 

 porphyry of Ternuay, in the Yosges, 

 whence "the name Yosgite. 



YuLPiNiTE. A siliceous variety of An- 

 hvdrite, containing 8 per cent, of silica. 

 It. 3 5. 



The Yulpinite from Yulpino, near Ber- 

 gamo, in Italy, takes a fine polish, and admits 

 of being cut for ornamental purposes. It is 

 known by artists as the Marmo Bardiglio di 

 Bergamo. 



w. 



Wad. The local name by which Gra- 

 phite (or Plumbago), is commonly known 

 in the North of England. For Cumberland 

 Wad, see Graphite. 



Wad, Allan, Dana, Nicol, Phillips. Oc- 

 curs in reniform, botryoidal, and arbores- 

 cent shapes, sometimes pulverulent or in 

 froth-like coatings on other minerals; also 

 massive, sometimes with curved laminar 

 divisions. Colour and streak brown or 

 black. Opaque. Lustre dull; glimmering 

 in grey varieties. Yery sectile. Yields to 

 the nail and soils the fingers. Feels meagre. 

 Yery sectile. Fracture earthy. H. about 

 0-5 to 1-0. S.G. 3 7. 



Analysis, from Upton Pyne, by Turner : 

 Protoxide of manganese . 73-60 

 Oxvgen .... 14-34 



Water 10-66 



Baryta .... 1-40 



100-00 

 Gives oflf water abundantly on exposure 



to heat in the matrass. 



BB behaves like Manganite ; with borax 



afi"ords a violet-blue globule. 



DD 



