676 SCIENTIFIC RECORD FOR 1683. 



limouite and pyrolusite. It is botryoidal or stalactitie iu form and 

 has a fibrous radiated structure. Tlie hardness is 3.5, the specific 

 gravity about 4. The color is pinkish or brownish to yellowish white. 

 The authors have since called attention to the fact that it is essentially 

 identical with the miueral rhabdophane, which was first announced in 

 1878 by Lettsom, and afterwards examined by Bertraud, and more fully 

 by Hartley. The analysis of the latter shows it to be a hydrous phos- 

 phate of the cerium and yttrium earths. The American mineral con- 

 tains no cerium oxide aud a larger percentage of the yttrium earths, 

 but the two conform to the same formula and are essentially the same 

 species. Rhabdophane is known only iu a few specimens, which were 

 obtained many years ago iu Cornwall, England, and which have since 

 been called blende. 



Silfbergite. — A mineral near authophyllite, and probably a variety 

 only peculiar in containing 8 per cent, of manganese protoxide. It 

 occurs iu bladed crystals aud crystalline aggregates with prismatic 

 cleavage like amphibole. It has a honey-yellow color aud vitreous 

 luster. It is described by Mats Weibull as occurring with other man- 

 ga uese minerals at Vester-Silfberg, Norrbiiike parish, Sweden. (Geol. 

 For. Fork., Stockholm, vt, 499.) 



Viandite. — A name given by Goldsmith (Peale's Report on Thermal 

 Springs) to an unusually hydrous variety of opaline silica or geyserite 

 from the Yellowstone Park. It forms a leathery incrustation, drying 

 to a soft, crumbling mass; it probably does uot represeut a definite 

 stable compound. 



MINERALOGICAL BIBLIOGRAPHY, 1883. 



I. — Mineralogical works. 



D'Achiardi, A. I metalli, loro miuerali e miniere. Vol: I, 402 pp., 



8vo. Vol. ii, C35 pp. Milan. 

 Dana, E. S. A text-book of mineralogy, with an extended treatise on 



crystallography and physical mineralogy. New edition, revised and 



enlarged. 521 pp., 8vo. New York. 

 Lapparent, A. de. Cours de iniueralogie. Paris. 

 Liversidge, A. The minerals of New South Wales. 2d edition. 137 



pp., 4to. Sydney. 

 Roth, Justus. Allgemeiue und chemische Geologit. 

 TsciiERMAK, G. Lehrbuch de miueralogie. 589 pp., 8v®. Vienna. 

 . Die mikroskopische Bescbaffenheit der Meteoriten erlautert 



durch photographische Abbildungen. Die Aufuahmen von J. 



Grimm in Offeuburg. Lief. 1. 



II. — Minera logical memoirs.* 



Becke, Fr. Aetzversuche an der Zinkblende. Tsimerinak, Miu. Petr. 

 Mitth., V, 457. 



# This list includes only tlie more important miueralogieal memoirs; a complete list 

 of papers would cover many pages, aud would be out of place here. 



