234 



MIITEKALOGT. 



of Girgenti, in Sicily. The other notes describe a pseudomorph of 

 calcite after rhombohedral dolomite from Traversella ; crystals of quartz, 

 with indented edges, from Oberstein and from Lisso, near Bologna ; 

 and crj^stals of cuprite showing similar irregularities from Cornwall. 



The second part contains descriptions of two new species, and a note 

 on ardennite. Aerinite is a bright blue compact hydrous silicate, in 

 which the bases are chiefly the two oxides of iron. It is a product of 

 decomposition, and is intimately associated with fragments of quartz, 

 olivine, felspar, and augite. Probably the mineral was obtained from 

 Spain. Pllinite is a new species from the granite of Striegau, occurring 

 in fine needles, and having the following composition : 2CaO . APO^ . 

 5SiO^H='0. F. W. R. 



Lasaulx, A. von. [Mineralogical Notices.] N. Jahrh. Heft iv. 

 p. 409-411. 



Describes (1) twin-crystals of Chabasite from Striegau, formed ac- 

 cording to the law — twin-plane a face of E, twin-axis a normal to R ; 

 (2) a kind of elastic bitumen from S. Australia ; (3) growth of garnet 

 and calcite in the porphyry of Rathen, in Silesia. P. W. R. 



[Mineralogical Notes.] N. Jalirh. Heft vi. pp. 623-633. 



Further remarks on the new species melanophlogite and pilinite. 

 Description of the microscopic structure of fibrous blende (Spiauterite) 

 from Przibram and from Albergaria Velha. The former consists mainly 

 of doubly-refracting hexagonal wurtzite, mixed probably with regular 

 •blende ; the latter is throughout isotropic, and therefore not referable 

 to wurtzite. Microscopic examination of certain garnets shows the 

 presence of a doubly refracting substance (Yesuvian ?). The typical 

 colophonite of Arendal is a mixture of Yesuvian and garnet, the former 

 prevailing. p. W. R. 



Laspeyres, H. [New Nickel-mineral.] N. Jahrh. Heft vii. p. 737. 



Gives the name Polydymite to a nickel-ore which contains R^Sg, and 

 occurs in polysynthetic twins of regular octahedra. Nickel-bismuth- 

 glance (Saynite) is not an independent species, but a mixture of bis- 

 muth-glance and polydymite. F. W. R. 



Laur, Fr. Les Calamines : Etude sur les minerals oxydes du zinc. 

 [Calamine.] Bull, Soc. Indust. Mm. St. Etiemie, 2 ser, t. iv. p. 

 275. 



Lea, Isaac. Further Notes on '' Inclusion" in Gems. Pp. 11. 8vo. 

 Philadelphia. 



Leidy, Prof. Remarks on the Structure of Precious Opal. Proc. 

 Ac. Nat. Sci. Philad. p. 195. 



Lemberg, J. Ueber Silicatumwandlungen. [Alteration of Silicates.] 



Zeitsch. deutsch. c/eol. Ges. Bd. xxviii. Heft 3, pp. 519-621. 

 Gives analyses of felspars in tourmaline-granite and red porphyry of 

 Predazzo, and laboratory experiments illustrating the decomposition 



