Mineralogkal Notices. 387 



u 



Art. XL. — Mineralogkal Notices. No, IIL 



(Concluded from page 222.) 



Orangite. — Dr. C. Bergemann of Bonn, (Pogg. Ann., Ixxxii, 

 561j) thus describes the mineral Orangite which contains the 

 metal, Donarium. Color yellowish-red, passing either to brown 

 or yellow; powder or streak light orange. In thin splinters 

 transparent; and in larger pieces translucent. Structure foliated 

 m one direction ; cross fracture flat conchoidal. Hardness be- 

 tween fluor spar and apatite, or 4'5 ; specific gravity 5-397, Berge- 

 mann, 5'34j Breithaupt. Small splinters heated in a platinum 

 spoon become dull-brown, and on cooling again of an orange 

 color, and the larger pieces lose their translucency. In a glass 

 tube gives off moisture. Held with the platinum forceps in the 



flame of a spirit lamp, there is slight decrepitation- B.B. on 

 charcoal infusible, the edges only being slightly glazed and per- 

 haps only from a mixture with foreign matters. Mixed with soda 

 the silica is dissolved, and the rest remains in the glass rendering 

 It opaque. With borax a yellowish pearl, becoming colorless on 

 cooling ; with salt of phosphorus in the outer flame, a reddish 

 glass, in the inner, yellowish, and in either case colorless on cool- 

 ing. With acids easily decomposed yielding with muriatic acid a 

 perfectly clear jelly, of a yellow color, and it is even attacked 

 by dilute acid. Digested for twenty-four hours with a solution 

 of an alkaline carbonate of ordinary concentration, it is strongly 



acted 



upon. 



This mineral is from Langesundfiord near Brevig in Norway, 

 ■^bere it occurs in zircon syenite, with wohlerite, mosandrite, 

 tnorite, zircon, hornblende, black mica. Its composition is given 

 on page 280 of this volume. 



,, Loganite^ a new mineral ; Mr. T. S. Hunt, (Phil. Mag. [4], 

 J!j 65, July^ 1851.) — Loganite occurs at Calumet Island on the 

 9^ta\va in white crystalline limestone, mixed with green serpen- 

 ^i^ie, phlogopite, pyrites and rarely crystals of apatite. The form 

 appears to be a prism, with the acute and obtuse lateral edges re- 

 placed and also the acute solid angles. Crystals small; edges 

 generally rounded, and faces faintly shining, with the lustre vit- 

 reous or vitreo-resinous. Cleavage parallel to the sides and base 

 of the prism distinct, macrodiagonal perfect. Color clove brown 

 to chocolate brown ; streak and powder grayish-white. Subtrans- 

 jjicent. Brittle, fracture uneven. Heated in a tube yields water 

 freely with an empyreumatic odor B.B. loses color, becoming 

 grayish- white, but infusible j with cobalt solution becomes blue. 

 With acids partly dissolved. 



1. 



2. 



acids partly dissolved. Composition, 







Si Si Pe % fiAfl 



c* 





32-84 13-3T 200 8512 17-02 



0-96= 



=101 -31 



82-14 1300 2-28 36'43 1683 



0-»3= 



=101-61 



