Journal of Applied Microscopy. 533 



Lorandit von Allchar in Macedonien. V. Careful crystallographic re-examina- 

 Goldschmidt. Zeit. f. Kryst. 30: 272- . _^ , ^ ^ . , 



294, 1898. tion ; Kenner s fourteen forms increased 



to thirty-two. l. McI. l. 



Mossite, Vid. Skrift. Math. Nat. Klasse, Name given by Brogger to a niobotan- 

 Kristiania. No. 7, p. i, 1887. , , . r , • , 



talate of iron, found with yttrotantahte 



at Moss, Norway. Occurs in black tetragonal crystals, mostly twins, with twin- 

 ing plane (101); may also be elongated parallel to (HI), as with rutile. r^O.644. 

 Composition = Fe (Nb Ta)2 O^, with Nb : Ta :: 1 : 1. G = 6.45. Author 

 states that the mineral is near tapiolite, and that the crystals of tantalite (^ skog- 

 bolite) represented in the text-books are practically identical with tapiolite. 



L. McI. L. 



Muscovite compacte de Montrambert (Loire). Occurs in the sericite schistS of this 

 G. Friedel. Bull. Soc. Min. 21: 135,1898. , ,.^ ,. , , . 



locality, surrounding quartz nodules, in 



amorphous condition without cleavage. Brownish green in color and very 



translucent, with greasy lustre. Analysis corresponds exactly to formula for 



muscovite. H = a little less than calcite. G = 2.788 at 15° C. 



Microscope proves it to be composed of fine fibres. Author considers it a 



variety of the sericite. l. mci. l. 



rt . „ , u TS.T . r Found near the surface in small aurif- 



Quartz — Pseudomorphs — Note on peculiar, 



found at Owera Mine, Opitonui, North Is- erous quartz veins in the soft country 



Mag. ^U: iT^Sgi ^' ^' ^' ^'"'^' ^'''" '°^^- Probably owe their origin to 



infiltration of silica into cavities left by 

 removal of calcite. The mass of the pseudomorph is compounded of small 

 crystals of different orientation. l. Mci. l. 



Prehnite dans les roches. A. Lacroix. Bull. Author refers to his previous notes on 

 Soc. Min. 21: 277,1898. , . . ,. , 



determining zeolites and accompany- 

 ing minerals (prehnite, etc.) and calls attention to the differences between prehn- 

 ite and thomsonite. l. McI. l. 



Tourmaline, The Quantitative Determination ^^ O^^er to avoid the introduction of 

 of Borac Acid in. Geo. W. Sargent. Thesis. alkalies, shown to be objectionable, the 

 Univ. of Penn. Philadelphia, 1898. , , , .. . 



author uses and describes in detail 



new methods for the decomposition of the mineral. The method is recom- 

 mended which involves volatilization of the boric acid as the methyl ester and 

 subsequent titration. Author concludes from his investigations that the formula 

 proposed by Clarke probably represents the structure of tourmaline. But as yet 

 such formulas have to be regarded with doubt, nothing being known regarding 

 the magnitude of the molecule. l. Mci. l. 



Wollastoaite, sur I'existence de la, comme ^n unusual occurrence of woUaston- 

 element dune aplite. A. Lacroix. Bull. ite, as an essential rock-forming mineral, 

 Soc. Min. 21:272,1898. . ,, , . . , ,. 



Cited by author in a vein of aplite at 



the base of " Roc Blanc," at the bottom of the little valley of Barbonilleres, 

 (Ariege). l. Mci. l. 



