414 YELLOW GOLD-GLANCE, 



many other localities in the United Kingdom. 

 Also at Amberg, in Bavaria, the Irlarz, 

 France, &c. It is used as a yellow pigment. 



Yellow Gold-Glance. See Yellow 

 Tellubium. 



Yellow Lead Ore, or Yellow Lead 

 Spar. See Wulfenite. 



Yellow Mineral Resin, Mohs. See 

 Amber. 



Yellow Molybdenated Lead Ore, 

 Kirwnn. See Wulfenite. 



Yellow Ochre. A variety of Ochre 

 resulting from the decomposition of Limou- 

 ite. Haussmann believes it to be a distinct 

 species, composed of 81'6 peroxide of iron, 

 and 18*4 water, in which case its chemical 

 composition is represented by the formula 



^e + 2H. 



It is found in several localities, amongst 

 others at Pary's Mine, Anglesea. 



When prepared by grinding and washing, 

 Yellow Ochre is used as a yellow pigment. 

 Sometimes it is exposed to the action of fire, 

 to increase the oxidation of the iron, and 

 to deepen the colour, which then becomes 

 reddish-brown. Yellow Ochre is stated by 

 Bunsen to be a valuable antidote to the 

 poison of arsenic. 



Yellow Orpiment, Jameson. See Or- 

 piment. 



Yellow Quartz. See Citrine. Lim- 

 pid and transparent Rock Crystal of a 

 lemon-, golden-, or wine-yellow colour ; re- 

 sembles Yellow Topaz in appearance, and 

 is often sold for it, though neither of the 

 same hardness, specific gravity, nor bril- 

 liancy. It is used chiefly for seal-stones; 

 it is also sometimes used in jewelry for 

 brooches, ear-rings, &c. Very good speci- 

 mens are found at Olivet, near Orleans. 



Brit. Mus., Case 20. 



M. P. G. Horse-shoe Case, No. 509. 



Y'ellow Sulphuret of Arsenic. See 

 Orpiment. 



l^ELLow Tellurium, Allan, Phillips. 

 See Sylvanite. 



Y^ENiTE. A name given to Lievrite, in 

 commemoration of the battle of Jena, fought 

 in 1806. 



M. P. G. Principal Floor, Wall-case 19. 



You-STONE. Jade. See Nephhite. 



Ypoleime, Beudant (from vmy.uiu.j/.a,, the 

 balance of account, i. e. the species of Hally 

 left afterthe separation of Apharfese.). See 

 Phosphochalcite. 



Y''tterbite. a name given to Gadolinite, 

 after that of one of its localities, Ytterby, in 

 Sweden. 



YTTROTANTALITE. 



Ytterspath. See Xenotime. 

 Yttertantal, Eckeberg. ) c.. Yttpo- 

 Yttertantalite, Jame- V^.tl.. tz 



son. JTANTALITE. 



Y'ttria Flu ate e, Dufrenoy. See Yt- 

 TRocERiTE. Yttria Phosphatee, Neckei\ 

 See Xenotime. 



Yttria Spar. See Xenotime. It occurs 

 as a white incrustation on Gadolinite and 

 other minerals from Ytterby, in Sweden, 

 {NicoD. 



Yttrocerite, Berzelius, Beudant, Dana, 

 Nicol, Phillips. Occurs in amorphous masses, 

 with a crystalline-granular and earthy struc- 

 ture. Colour violet-blue, inclining to white 

 and grey, or greyish-red. Opaque. Lustre 

 glistening. Fracture uneven. H. 4 to 5. 

 S.G. 3-4to3'5. 



Comp. CaF,YF,CeF, or sesquifluoride of 

 cerium, with fluoride of yttrium and fluoride 

 of calcium (Fluor). 

 Analysis, from Finbo, bv Gahii ^ Berzelius: 

 Lime . . . ' . .50-00 

 Peroxide of cerium . . 16*45 



Yttria 8-10 



Hydrofluoric acid. . . 25*45 



100-00 



BB alone, loses colour and becomes 

 white, but does not fuse. With Gypsum, 

 fuses to an opaque globule. 



Dissolves in boiling muriatic acid. 



Localities. Finbo and Broddbo, near 

 Fahlun, in Sweden; imbedded in Quartz, 

 with Albite and Topaz. Amity, Orange co.. 

 New York, U.S. 



Name. From its composition; chiefly 

 Y''ttria and Cerium. 



Brit. Mus., Case 58. 



Yttro-columbite, Dana. See Yttro- 

 tantalite. 



Yttroilmenite, Hermann. See Sa- 

 marskite. 



Yttrotantal, Karsten. I^ttrotanta- 

 lite, Dana, Eckeberg, Dufrenoy, Nicol, 

 Phillips. Three varieties of this mineral 

 are described by Berzelius, viz, 1, Dark 

 ox Brownish-black; 2, Yellow; and 3, Black. 



1. The dark or brownish- black is trans- 

 lucent, and of a pale yellow colour, when in 

 thin laminje. Lustre vitreo-resinous. Streak 

 white. Occurs in amorphous masses, or in 

 thin plates with the yellow variety. H. 4-5 

 to 5. S.G. 5-39 to 5-88. 



Comp. 4 (Ca, Y, ir, Fe) Ta. 



BB decrepitates slightly, and becomes 

 light yeilow, but does not fuse. With a 

 large quantity of borax, forms a transparent, 



