Third Supplement to Dana's Mineralogy. 



263 



Volknerite [p. 134]. — Analyses by Rammelsberg of the mineral from Snarum, 

 called also Hydrotalcite (Fogg, xcvii, 296): 





C 



£l 



Mg 



fi 





1. 



261 



3727 



1925 



41 59 



= 100-72 



2. 



6 05 



38 18 



17-78 



[37-99] 



= 100-00 



3. 



7-32 



37 30 



18-09 



[37-38] 



=- 100 00 



4. 



7-30 



37-04 



18-87 



37-38 



= 100 59 



The mineral was in bent or curving lamellae, which break into fibres. G.=2091. 

 Rammelsberg regards the carbonic acid as introduced subsequent to the formation 

 of the mineral, and obtains the formula, Mg ^cl+4Mg H3— alumina 19*80, magnesia 

 38-56, water 41 64=100; or perhaps, &l fi 3 -|-5Mg fi'^alumina 1914, magnesia 

 37-27, water 43 59=100. 



Wittichite (Kupferwismutherz) [p. 88, and Suppl. i].— Analysis by E. Tobler 

 (Ann. Ch. u. Pharm., xcvi, 207).— (1) part soluble in muriatic acid ; (2) part insoluble, 

 ibid. ; (3) the whole together : 



S Bi Cu Fe 



1. Soluble part, 16 00 4912 30 70 1-64 = 97-46 



2. Insoluble part, 1-26 0*53 0 86 1-27 = 3-96 



3. Whole, 17-26 49-65 31*56 2 91 =101*38 



The results agree nearly with those of M. Schneider. The formula may be 

 2€>u S-f-Bi 2 S 3 ; but the sulphur is not sufficient for it. It corresponds better with 

 the analyses to write it, 2<3u S+Bi 2 S 2 , or -Cu S-{-Bi S ; the iron being included 

 with the <3u. ,- 



The composition of this ore from Wittichen is discussed by R. Schneider, in Pogg. 

 Ann., xcvii, 476. 



Wolfram [p. 351, and Suppl. i, n]. — An imperfect crystal of wolfram from the 

 west shore of " Chief's Island," Lake Couchiching, Canada West, has been described 

 by E. J. Chapman (Canadian Jour. [2], i, 308). It was found there in a boulder con- 

 sisting of gneiss traversed by a vein of coarse granite, containing red orthoclase and 

 some magnetite. 



Xenotime [p. 401, and Suppl. i, n3. — E. Zschau has described the associations of 

 Xenotime in the granite of Hitteroe, Norway, in the Neues Jahrb. f. Min. etc., 1855, 

 513. The minerals occurring with it are allanite, malacone (related to zircon), poly- 

 crase, titanic iron ; and very rarely gadolinite. The crystals of xenotime sometimes 

 form regular twins with malacone (this Journ., xx, 273), and also have a regu- 

 larity of somposition with some crystals of orthite (allanite), titanic iron and poly- 

 crase. For details, we refer to the paper. 



Analysis of the xenotime afforded, P* 30*74, Yttria 60*25, Ce 7*98, Si, Fe, trace. 



Zincite [p. 110, and Suppl. n]. — Occurs at Schneeberg as a pseudomorph after 

 Blende.— Hartm. Berg. u. Hutt. 1853, in N. Jahrb., 1855, 841. 



Additional references. 



American localities. — At Canton Mine, Ga., according to Prof. C. U. Shepard (Rep. 

 1856), chalcopyrite, harrisite, erubescite, hitchcockite, melaconite, galena (contain- 

 ing 3d to 56 oz. silver to the ton), pyromorphite, plumbo-resinite "in thin seams 

 and varnish-like coatings," pyrites, marcasite, mispickel, blende, native copper, au- 

 tomolite, staurotide, kyanite, ilmenite. 



Minerals accompanying the Gold of Australia. Quart. J. Geol. Soc, 1854, x, 303. 



On the minerals and pseudomorphs of Przibram, by E. Kleszczynski, Jahrb. k. k. 

 geol. Reichs., 1855, 46. 



