93 PHYSIOGRAPHY. 



along with octahedral Bismuth, pyramidal Copper-pyrites, 

 &c. 



CUPREOUS MANGANESE. 



Cupreous Manganese. JAM. Syst. Vol. III. p. 558. 



Small reniform and botryoidal groupes, massive. 



Composition impalpable. Fracture imperfect 



conchoidal. 

 Lustre resinous. Colour blueish-black. Streak 



unchanged. Opake. 

 Not particularly brittle. Intermediate between 



semi-hard and soft. Sp. Gr. = 8-197 ... 3-216, 



BREITHAUPT. 



Before the blowpipe it becomes brown, but is infusible. 

 To borax and salt of phosphorus it communicates the co- 

 lours of copper and manganese. It consists, according to 

 LAMPADIUS, of 



Black Oxide of Manganese 82-00. 

 Brown Oxide of Copper 13-50. 

 Silica 2-00. 



BERZELIUS found it to contain a considerable quantity of 

 water. 



It occurs in the tin mines at Schlaggenwald in Bohemia, 

 and was first distinguished by Messrs BREITHAUPT and 

 LAMPADIU s. 



DIASPORE.' 



SPAP. 



Diaspore. JAM. Man. p. 322. Diaspore. PHILL. p. 78. 

 Diaspore. HAUY. Traite, lere Ed. T. IV. p. 358. 



Prismatic.* Cleavage P -j- oo = 130 (nearly). 

 More distinctly Pr -f- oo. 



* Mr PHILLIPS mentions a doubly oblique prism, a tetarto- 

 prismatic form, Sim. Fig. 82. Incidence of M on T ss 64 54', 

 of P on T = 101 20', of P on M = 108 3<X. H. 



