XANTHOSIDERITE. 

 Orthite containing much Avater. S.G. 2-78 

 ! *o2-9. 



j " Locality. Eriksberg and Kullberg, in 



j Sweden. 



1 Name. From Ic-i-ffi,-, yellow, and Orthite 



I (from k^k, straight). 



I Xaxthosiderite, ^. /Sc7i?mc?;. Occurs in 



stellate and concentric aggregations of fine 

 needles or fibres, with a silky or greasy 

 lustre. Colour golden yellowish-brown to 

 brownish-red. H. 2-5. 



Comp. ¥e H2. 



A.nalysis, of brown vai'iety, by -E*. Schmidt : 

 Peroxide 6f iron . . . 75"00 



Silica 5-02 



Alumina . . . .1-51 

 Peroxide of manganese . 1'33 

 Water 14-10 



96-96 

 Locality. Ilmenau, in the Harz, with 

 ores of manganese. 



Name. Prom lix.vdo;, yellow, and (rilrioo?^ 

 iron. 



Xenolite. a fibrous mineral resembling 

 Kyanite, as well as Bucholzite. The recent 

 investigations by Des Cloiseaux into the 

 optical properties of Xenolite, made with the 

 polarising microscope, prove it to be a 

 Siliimanite. S.G. 3-58. 



Comp. 2A1 Si, or Ai* Si^ (Des Cloiseaux). 



Analysis, from Finland, by Komonen ; 

 Silica ..... 52-54 

 Alumina . . . .47-44 

 Potash . . . . trace 



99-98 



Locality. Peterhoff, Finland; in loose 

 blocks with Worthite. 



Name. From |sv«?, a guest, and^/^o?, sto7ie. 



Brit. Mus., Case 26. 



Xexotime, Beudant. Pyramidal: pri- 

 mary form a rectangular prism, Mdth a 

 square base. Colour j'ellowish - brown. 

 IS early opaque. Lustre resinous. Streak 

 pale brown. Fracttire uneven and splintery. 



H. 4-5 to 5. S.G. 4-4 to 4-55. 



Comp. Phosphate of Yttria, or \^V- 

 yttria 63, phosphoric acid 37^100. 



YELLOW IROX OCHRE. 413 



Analysis, from Xorwa}', by Berzelius : 

 Phosphoric acid, with trace 



of fluoric acid . . . 33*49 



Yttria 62o8 



Sub-phosphate of iron . . 3-93 



100-00 



BB on charcoal, alone, infusible. With 

 borax, yields a colourless globule, which be- 

 comes milky on cooling. 



Insoluble in acids. 



Localities. Ytterby, in Sweden, Lindes- 

 naes, in Norway, in crystalline masses, 

 imbedded in granite. Clarksville, Georgia, 

 U.S. 



Name. From l^yo;, vain, diX\&'!-ty-'->i, honour, 

 because phosphate of Yttria has been mis- 

 taken for a new metal, to which the name 

 Thorium was given, which is now applied 

 to the metal discovered in Thorite. 



Brit. Mus., Case 57. 



Xylite, Hermann. A mineral allied to 

 Xylotile, in composition, and resembling it 

 also in its brown colour and asbestiform 

 structure. 



It is supposed to have been brought from 

 the Ural. 



Name. From IvXov, wood, and A/^o?, stone. 



Xylochlore, v. Waltershausen. A mineral 

 bearing a close resemblance to Apophyllite, 

 found in olive-green crystals in Iceland. 

 H. 6. S.G. 2-29. 



Name. l'^>'-ov, wood, and %>^^^?«V, green. 



Xylotile, Glocker. A delicately fibrous 

 mineral, considered by Kenngott to be altered 

 Chrysotile. Colour various shades of wood- 

 brown, also green. Opaque. Lustre glim- 

 mering. Streak shining. Soft. S.G. 2-4 

 to 3-56. 



Locality. Sterzing, in the Tyrol. 



Name. From l^Xov, wood, and t/ao?, fibre. 



Y. 



Yanolite. See Axinite. 

 Yellow Copperas. See Copiapite. 

 Yellow Copper 0re,"\ 

 Kirwan. f See Chalco- 



Yellow Copper Py- Tpykite. 



RITES. J 



Yellow Earth, Jame-^ An impure va- 

 son, Nicol. f riety of Limo- 



Yellow Iron Ochre, Tnite, or perhaps 

 Greg ^ Lettsom. ) a mixture of Li- 



monite with hydrous silicate of alumina. It 

 is found at Pary's ]Mine, in Anglesea ; in the 

 Forest of Dean, Gloucestershire; and in 



