252 MINEEALOGr. 



Gold reduced from solution by organic matter. Chem. News, 



vol. XXX. pp. 162, 163. 

 It has been alleged that gold reduced from solution of its chloride 

 by means of organic matter, such as wood, may be deposited around a 

 nucleus of gold. Mr. Skey doubts this statement. He finds that the 

 metal precipitated in this way assumes an incoherent form, and sug- 

 gests that nuggets in the Drift have been formed by the reducing 

 action of metallic sulphides, not of organic matter. F. W. R. 



SzEY, ^Y. On the Formation of Gold Nuggets in Drifts. Chem. 

 News, vol. XXX. pp. 172-174. 



Suggests that the gold was originally disseminated through certain 

 rocks, rather than in reefs ; that sulphuretted hydrogen may attack the 

 metal, producing a sulphide soluble in solutions of alkaline sulphides ; 

 and that this auriferous solution is ultimately reduced by metallic sul- 

 phides, such as iron-pyrites. The formation of gold nuggets may 

 therefore be still going on in many of the Drifts. F. W. E. 



Smith, C. The distribution of Spathic Iron Ore. Journ. Iron and 

 Steel Inst. no. 1, pp. 157-165. 



. The Iron Ores of Sweden. Journ. Iron and Steel Inst. no. 



2, pp. 310-319 (discussion, pp. 320-328) ; and Coll. Guard, vol. 

 xxviii. p. 414. 

 The Swedish iron-ores are magnetite, red haematite, and brown haema- 

 tite with some clay ironstone in the Skania coalfield. 



• The iron-ores are chiefiy found in connexion with a felspathic rock 

 peculiar to Sweden, " Helleflinta" (Leehte). The mines of Bispberg, 

 Persberg, Grangesberg, Norberg, Nora, Schysshyttan, and Taberg are 

 described, with the mode of working the ores. G. A. L. 



Smith, J. Laweence. Warwickite. Amer. Journ. ser. 3, vol. viii. 



pp. 432-434 ; Compt. Rend. t. Ixxix. pp. 696-698 ; Ann. Chim. 



ser. 5, t. iii. pp. 425-427. 



Analyses of this mineral have Litherto been marred by impurities. 



Particles of spinel are in the rock and are very difiicult to separate. 



By picking ont under a lens, the sample . obtained gave 20 per cent. 



of boracic acid : the silica and lime hitherto found are impurities. The 



formula proposed is 5MgO . 3B03 + (MgO . FeO) 2TiOo. E. B. T. 



Curious Association of Garnet, Idocrase, and Datolite. 



Amer. Journ. ser. 3, vol. viii. pp. 434-436 ; Compt. llend. t. Ixxix. 



pp. 813, 814; Ann. Chim. ser. 5, t. iii. pp. 428-430. 

 The country-rock being calcite, these three minerals occur together. 

 The idocrase does not exhibit its crystalline form, but permeates the 

 crystals of garnet ; a large crystal of garnet cut in two and polished 

 shows the idocrase penetrating it like so many green streamlets. It 

 came from Santa Clara, California. E. B. T. 



. El Corindo de Carolina Norte, Georgia y Montana. [Corun- 

 dum of North Carolina &c.] Revista Minora, xxv. pp. 25-32. 



