224 MINERALOGY. 



Blake, Dr. James. On Koscoelite, a Vanadium Mica. Amer. Journ. 

 ser. 3, vol. xii. pp. 31, 32 ; Chem. News, vol. xxxiv. no. 871, p. 46. 



Describes under this name a well-marked species of mica, containing 

 a large percentage of vanadium. It occurs in the hanging wall of a 

 small quartz-vein in porphyry, in a gold-mine at Granite Creek, El 

 Dorado County, in the lower hills on the western slope of the Sierra 

 Nevada, California (see Genth, p. 228). G. A. L. 



Blake, Prof. W. P. Notes on the Occurrence of Siderite at Gay 

 Head, Mass. Trans. Amer. List. Min. Eng. vol. iv. pp. 112, 113. 



This mineral occurs in thick beds in the clay formations of Martha's 

 Vineyard. It is found in masses which have been loosened from the 

 clay beds forming the bluffs ; and they contain imprints of leaves and 

 stems of plants. Some of the beds are of secondary origin. R. B. N. 



Manufacture of Ferro-Manganese in Austria. {Amer. Inst. 



Min. Eng.) Iron, n. s. vol. vii. p. 551. 

 Analysis of ore. 



Blomstrand, C. W. Bidrag till kannedomen af Langbangrufvans 



mineralier. [Minerals of Langban Mine, Sweden.] Geol. Foren. 



Stockholm Fork. Bd. iii. pp. 123-133. 



Contains a description of the mode of occurrence of manganesite and 



some other minerals, and analyses and description of Barylite, a new 



mineral, whose formula is : — 



Boficky, Prof. Dr. Em. Ueber einige ankerit-ahnliche Minerale der 

 silurischen Eisensteinlager und der Kohlenformation Bohmens, 

 und iiber die chemische Constitution der unter dem Namen Ankerit 

 vereinigteu Mineralsubstanzen. [On Minerals of the Ankerite 

 Group from the Silurian Iron -ore deposits and from the Coal for- 

 mation of Bohemia, and on the Chemical Constitution of the Sub- 

 stances grouped under the name of Ankerite.] Min. Mitth. Heft i. 

 pp. 47-58. 

 With few exceptions the ankerite-minerals may be referred to the 

 general formula — CsiGO^-^'FeCO^ + £c{GsiCO^ + MgCO^), where ^ may 

 have 10 values, viz. |, 1, |-, f, f, 2, 3, 4, 5, 10. Proposes to separate the 

 first 5 varieties as Ankerite, and the second 5 as Parankerite. If ^=1 

 the variety is called normal ankerite ; if »r = 2, normal parankerite ; while 

 the other varieties are distinguished by addition of Greek letters, as 

 Ankerite y, which is an association of one molecule of ankerite with 

 one molecule of parankerite. P. W. R. 



Braun, Max. [Silicate of Zinc in Sardinia]. N. Jahrb. Heft v. 

 pp. 538, 539. 



Note on occurrence of Galmei-veins near Elvas in Sardinia. The 

 mineral forms horizontal strings in the saalbands of a dyke of porphyry 

 which cuts through syenite. The sides of the dyke are formed by a 



