Tenth Supplement to Dana's Mineralogy. 213 



It is compact, with conchoidal fracture ; dull, but becomes lustrous on 

 ilor, white ; Hoft and very friable ; adheres strongly to the ton^nie. In 

 not soften, but becomes translucent and opaline on the edjjes, disengagmg 

 ( bluish-gray. B.B. infusible, with cobalt solution gives a blue 



Si SI % fl _ 



cribed it as pure hydrated silicic acid (Si O3, HO). 



-See COPPEE-GLANCK. 



p. 230, IX].— Analysis of hauyne, from the lava of Melfi, by Ram- 



{Zdhchr. geolog. Oesellsch., xii, 273, in Kopp's Jahresbnicht, 1860, 776). 



Hornblende [p. 170. T-IV, VI-VIII].-Breithaupt has §^'^«^^ ^^^^^"^^™^^ ^J^J*' 



, velv.-Jblarlc cdor. "a"greenth'gray TS and is^'opaque. Cleavage, prismatic'. 



a=6. G.=312. Analysis by R.Miiller(B.anrfZf.2«i<Mn^, XX, 53): 



Si *l ^e Mn 6a iflg JTa g 



I 46-58 13-63 12-29 6-00 8-83 8-44 3-17 I'OO = 99-94 



[The large amount of manganese is quite remarkable ; the oxygen ratio, as given by 

 I the author, for the bases and silica, is as 16 98: 2404 or 2 : 3 It is noteworthy that 



Occurs in irregular brittle nodules, of an ironblack color black streak and sub 

 Wlic lustre. H.=5. G.=4-692 (Kopp, Jahre^bencht, 1859, 7 /oj. 

 WiTE [p. 214, VII].— N. V. Kokscharow h^^^f'jj||]^ a^lociattd^w?h"alS'tr 



'irir,'""io ?e« % «* =«='<'^»» 



-Mat Min. Rmslands, iii, 253, in Kopp's Jahresbericht, 1860, 767. 



this mineral, described by Hermann 



laiTK [p. 103].-Claus considers that this mineral, descriD 

 fomp,,und of oxydized platinum metals with the osyd^s^^of 



ning a pur 



washiug of such a complicate 

 "^anTfound it to be a mixture < 

 smine and chromic iron.— (/mi 



»» [p. 17, II, VIII].— BoTJSsingault has found trac 

 'f aoartL (Ann. l Chim. et de Fhys., (3,) bau, 3 



