Tenth Supplement to Danas Mineralogy. 



.itney(thi.Joun,al.[2], 



'roc. B<M. Soc. Nat. H%*t., 



the Isle Rojale, Quincy, Miirquelte, 



tins of \Veiiewoo(i-ware. H.=:5-5. Other physical properties the same aa alreadj 

 given by Whitney. Analyses of two specimens gave : 



Si B Ca IPeSl Cu S qimrtz. _ 



It contains less water than is given for crystallized datholite, and Dr. Hayes suggests 

 the po^^sibility that in fortner analyses the water may have been given too high, 



these minerals as found at other localities. The compact datholite is of frequent 

 Portage Lake, Keweenaw and Ontan.igon districts. Very fine specimens occur at 



, 167). 



A trace of zinc -was also found. Tschermak considers it as identical with dfchenu ■ 

 Breithaiipt trives this name to what he considc-rs to be a new form of sulphid of fil- 



glaiice. Thean-ieof\heVrism was detTrmlfed to beTl6T^GS7 02. Naux-d 

 after Deleniinzin, the ancient name for Freiberg. Locality of the mineral not stated, 

 but it is probably from Freiberg. 



DiAMTE [Suppl. IX].— Damour and Deville have shown that v. Kobell's dia"i^ 

 acid is identical with hy|)ocoliimbic acid, consequently this mineral can no longer be 

 considered as distinct from iM\U\\\.Q.—{Compte8Renduit, liii, 1,044.) 



DoMETKTTE [p. 36, V].— F. A. Genth confirms the observations of Hunt ^"^^^^J"^^ 



a little below that of fli.or. G. at 16° C. T75. ' Color, on fresh fracture, tin- 

 white to steel?ray, quickly tarnishing, first into yellow and pinchbeck. «ft*^'''!" ,, 



and arseuiate of copper. Analyses : 



Analysis T contained 55, and 11. 6-71 pr. ct. quartz. Excludin;^ the qua 

 give the formula Cu^is=A3 29 25, Cu 71-68— (this .Journal, xxxiii. 193). 



Analysis oi d-)me,ikUe from the Corocora Copper Mines, by D. Forbes (Q< 

 Geol. Soc., xvii, 44) : 



^Cu Ag As 



It was fotrad in the form of gray metallic grains, disseminated in sandstone 



DaFREvrrE [p. 427. IV] —F. Pisani has ana 

 Terre. (Morbihan, France,) where it occurs in' dark gr« 



