470 KECORD OF SCIENCE FOR 1886. 



Tellurite. Faczebaja, crystals tlescribed, Breziua, Anu. Mus. Wien, i, 136. 

 Tetrahedrite. Pulacayo mine, Haauchaca. Bolivia, crystals described, vom Rath, 



Ber. uied. Ges. Bonn, June 7. 

 Thomsonite. Scoulerite, microscopic examination, Lacroix, Bull. Soc. Min., ix, 80. 

 Titaxite. Nordmark, crystals described, G. Flink, Bihang Vet. Akad. Handl., xix, 



12, 69. 

 Topaz. Durango, Mexico, crystals described, with numerous new planes, Des Cloi- 

 zeaux. Bull. Soc. Min., ix, 135. 

 Ural, indices of refraction measured, Ramsay, Zs. Kr., xii, 209. 

 Brazil, pyroelcctrical experiments. Mack, Wied. Ann., xxviii, 153. 

 Investigation of inclusions, Nordenskiold, Jb, Min., i, 242. 

 Nathrop, Colorado, occurrence in lithophyses of rhyolite, W. Cross, Am. J. Sc, 



XXXI, 432. 

 Occurrence with tin, deposits of Mount Bischof, Tasmania, described, Groddeck, 

 Zs. G. Ges., XXXVIII, 370. 

 Tourmaline. Pierrepont, New York, crystals described, vom Rath, Ber. nied. Ges. 

 Bonn, July 7. 

 Alexander Countj% North Carolina, crystallographic note, W. E. Hidden, Am. 



J. Sc, xxxii, 206; vom Rath, Ber. nied. Ges. Bonn, February 8. 

 Electrical experiments, Schedtler, Jb. Min., Beil.-Bd., iv, 519. 

 Tridymite. Twin crystals discussed, vom Rath, Ber. nied. Ges. Bonn, July 7. 

 Turquoise. New Mexico, chemical and microscopic examination, F. W. Clarke and 



J. S. Diller, Am. J. Sc, xxxit, 211. 

 Urvolgyite (Herrengruudite). Sandberg, Hungary, occurrence described, Szabo, 



Zs. Kr., x,,267. 

 Vanadinite. Arizona and New Mexico, crystals described, S. L. Penfield, Am. J. Sc, 



xxxii, 441 ; occurrence, .T. C. Cooper, Washburn Coll. Bulletin, i, 169. 

 Variscite. Arkansas, optical characters, Lacroix, Bull. Soc. Min., ix, 5. 

 Vermiculite. See Lucasite and Muscovite. 



Vesuvianite. Zermatt, association with garnet, Lewis, Min. Mag., vii, 9. 

 Composition discussed, Rammelsberg, Zs. Geol. Qcs., xxxviii, 507. 

 Jacobsberg, Sweden, analysis showing the presence of 4.7 i)er cent, of MnO., 



Igelstrom, Bull. Soc. Min., ix, 22. 

 Var. ynangan-vesuvianile, crystals described, with analysis, G. Flink, Bihang Vet. 

 Akad. Handl., xii, 2, 57. 

 ViViANiTE. Artificial crystals studied, Ces^ro, Ann. Soc. G^ol. Be]g.,M6ni., xiii, 21. 

 Yuba County, California, crystals described, A. W. Jackson, Proc Cal. Acad. Sc, 

 No. 4, 370. 

 Waluewite. See Xanthophyllite. 

 Warwickite. Edenville, New York, oi)tical examination, Lacroix, Bull. Soc. Min., 



IX, 74. 

 Wavellite. Optical characters, Lacroix, Bull. Soc. Min., ix, 4. 

 Wehkllte. Deutsch-Pilsen, analysis, Sipocz, Zs. Kr., xi, 212. 



WiiEWELLiTE. Burgk, near Dresden, crystals described, Weisbach, Jb. Berg- Hiitt. 

 Witiiamite. Scotland, optical examination, Lacroix, Bull. Soc. Min., ix, 75. 

 Wolframite. Sierra Almagrera, crystals described, Seligmann, Zs. Kr., xi, 347 



Felsobanya, analysis, Sipocz, Zs. Kr., xi, 211. 

 Wollastoxite. An artificial mineral of the composition CaSiOa, Doelter, Jb. Min., 



I, 119. 

 Wulfenite. Yuma County, Arizona, occurrence, J. C. Cooper, Washburn Coll. Bul- 

 letin, I, 169. 

 Xantiiolite. Scotland, optical examination showing identity with staurolite, La- 

 croix, Bull. Soc Min., ix, 78. 

 Xanthophyllite. Var. waluewite, exact determination of crystalline form and anal- 

 ysis, N. vou Kokscharow, Min. Russland, ix, 273. 



