1856.] DICK CLEVELAND IRON-ORE. 357 



4. Analysis of the Cleveland Iron-Ore ^ from Eston. 

 By A. Dick, Esq., Metallurgical Laboratory, School of Mines. 



[Communicated by Dr. Percy, F.G.S.] 



The ore was weighed after drying at 100° C. 



Protoxide of iron 39*92 



Peroxide of iron 3*60 



Protoxide of manganese 0*95 



Alumina 7"86 



Lime 7*44 



Magnesia 3*82 



Potash 0-27 



Carbonic acid 22*85 



Phosphoric acid 1*86 



Silica, soluble in hydrochloric acid .... 7*12 



Sulphuric acid trace 



Bisulphide of iron (iron-pyrites) ...... 0*1 1 



Water in combination 2*97 



Organic matter trace 



Residue, insoluble in hydrochloric acid. . 1*64 



100*41 

 Composition of the residue insoluble in hydrochloric acid : 



SiUca, soluble in dilute caustic potash, con- 

 sisting chiefly of oolitic concretions .... 0*98 

 Silica, insoluble in dilute caustic potash . . 0*52 

 Alumina with a trace of peroxide of iron. . 0*10 



Titanic acid, about 0*03 



Lime '. trace 



1*63 



The ore contains no metal precipitable by sulphuretted hydrogen 

 from the hydrochloric acid solution. 



In the residue insoluble in hydrochloric acid, minute, bright, black 

 crystals were detected, which were proved to contain titanium, and 

 were supposed to be anatase. Prof. Miller of Cambridge has been 

 able to measure certain of the angles, and found them to be identical 

 with similar angles of anatase. The discovery of this mineral in the 

 Cleveland ore is at least a point of considerable mineralogical in- 

 terest, and may possibly furnish some additional indication of the 

 nature of the rock from which it was derived. 



The silica in the insoluble residue exists, it will have been ob- 

 served, in two states, about two-thirds being soluble in dilute caustic 

 potash, and one-third insoluble in that solvent. The rounded white 



* See also the * Memoirs of the Geological Survey,' 1856, p. 95. This iron-ore 

 is derived from the Marlstone or Middle Lias series of the Cleveland district in 

 the north-eastern portion of Yorkshire. See also a notice of this ironstone by 

 Mr. Crowder ; Edinb. New Phil. Joum. new ser. vol. iii. no. 2. April 1856, p. 286. 



