PHYSIOGRAPHY. 281 



Wolfram Xenotime. 



and divergent, and often rather strongly coherent. Pseudo- 

 morphoses in the shape of Tungsten. 



1. When heated before the blow-pipe, it decrepitates, but may be 

 melted in a sufficiently elevated temperature into a globule, having its 

 surface covered with crystals possessing a metallic lustre. It dissolves 

 readily in borax. 



2. Analysis. 



By BERZELIUS. 



Tungstic acid 78-77 



Protoxi le of manganese 6-22 



Protoxide of iron 18 32 



Silica 1-25 



3. It is frequently met with attending; Tin-ore, in veins and beds. It 

 also accompanies Galena in veim, traversing greywacke, and is found 

 in beds and veins of Quartz, with Galena, Native Bismuth, Blende, &c. 



4. It abounds in nearly all the tin-mines of Europe, and occurs in sev- 

 eral places at Cornwall. It exists in greywacke in the principality of 

 Anhalt ; in the island of Rona one of the Hebrides, in graphic granite, 

 and in Siberia with Beryl. 



It is found in cleavable masses, columnar and nearly impalpable, and 

 in lar^e pse uloiiioiphous crystals, at Lane's mine in Monroe, (Conn.) 

 where it is associated 'with Tungsten, Tungstic-Ochre, Blende, Galena, 

 Iron Pyrites, Native Bismuth, &c. ; also in Trumbull, (Conn.) in the To- 

 paz vein, but in smaller quantity. 



WOLLASTONITE. (See Tabular-Spar.) 

 WOLNIN. (See Heavy -Spar.) 

 WOOD-COPPER. (See Olivenite.) 

 WOOD-OPAL. (See Opal.) 

 WOOD TIN. (See Tin-Ore.) 

 XANTHITE. (See Idocrase.) 



XENOTIME. Prismatoidal Tungstic-Ba- 

 r y t e . 



Pimary form. Octahedron with a square base. 

 24* 



