228 MINERALOGY. 



lysis of so-called "pale knebelite " from Dannemora, Sweden.] 

 Geol. Foren. Stockholm Forh. Bd. iii. pp. 116, 117. 

 The chemical composition of the mineral is represented by the for- 

 mula : — FeCl^ -1- 3 (5E0 -\- 4SiO J -|- 8H^0. It is the same mineral which 

 was determined in 1874 by Prof. A. E. Nordeiiskiold to be pyrosmalite. 



E. E. 



Field, Frederick. Note on a New Cornish Mineral. Chem. News^ 



vol. xxxiv. no. 880, p. 146. 

 Preliminary note on a mineral found to contain SFeO . P^O. . 4II2O. 

 [Afterwards described as Ludlamite.'] 



Foster, Clement Le Neve. Hcnwoodite. Chem. News, vol. xxxiv. 

 no. 882, p. 173. 



Letter on Major Eoss's blowpipe examination of Henwoodite. His 

 supposed " new test for cupric phosphate " is only a modification of 

 Berzelius's method of fusing with lead. F. W. E. 



Frenzel, A. [Quartz vrith Fluor-spar at Schneeberg.] N. Jahrh. 



Heft ii. p. 171. 

 Continuation of a controversy with Dr. Stelzner. 



Friedel, Ch. Histoire de la Mineralogie. [History of Mineralogy.] 



Rev. 8ci. xi. pp. 505-511. 

 Eecounts researches, especially on the artificial production in the 

 laboratory of numerous minerals. 



Geinitz, F. E. Studien iiber Mineralpseudomorphosen. [Studies 



on Pseudomorphs.] N. Jahrh. Heft v. pp. 449-503 ; plate and 2 



woodcuts. 



Applies the microscope to the study of pseudomorphs. Maintains 



that the classification of pseudomorphs must be based on the chemical 



relation of the original to the altered mineral. Blum's division of "Yer- 



drangungs -Pseudomorphosen " is criticised, and the name rejected. 



The microscopic characters of 30 pseudomorphs are described. Some 



pseudomorphs of chalcedony after calcite show microscopic particles 



of calcite, which do not represent the original mineral, but are recent 



products. Like appearances are presented by some of the well-known 



pseudomorphs of blue chalcedony after cubic fluorite, from Transylvania. 



F. W. E. 



Genth, Dr. F. A. On some American Vanadium Minerals. A^yier. 



Joiirn. ser. 3, vol. xii. pp. 32-36 ; and Chem. News, vol. xxxiv. 



no. 874, pp. 78-80 ; and " On Eoscoelite," Phil. Mag. ser. 5, vol. 



ii. pp. 156-158. 



Gives analyses and full descriptions of Eoscoelite (see Blake, p. 224), 



a vanadium-mica ; and of psittacinite, a new hydrous vanadate of lead 



and copper, from Iron Eod Mine, Silver Star District, Montana. 



. Second Preliminary Eeport on the Mineralogy of Pennsyl- 

 vania. Harrishurg. 



