188 Mr. Brooke ow Titanious Iron and Aeschenite. 



ened in the direction of the axis of the prism, and modified 

 as in the accompanying figure. 



Planes e, h, i. 



Symbols B, G, G. 



M,M'= 136° 20' 

 10 

 36 

 50 

 4.4, 

 32 

 10 



Titanious Iron. 

 The spec. grav. of the titanious iron is 4'*74. Hardness 

 much less than oligiste iron. The measurements of Mr. Levy's 

 figure are Olig. Iron. Axot. Iron. 



p,a\ = 122° 6' 



p,p, below 85 36 86° 10' 85° 59' 

 I give the axotomous iron on the authority of Mr. Haid- 

 inger's Mineralogy. 



Mr. Levy's e3 does not occur on the crystals I have seen ; 

 but I find the planes of an obtuse rhomboid, produced by 

 tangent planes on the terminal primary edges, and calling 

 these il, they give the following measurements: 

 a\M = 141° 26' 

 bl.b'l = 114 38 



Aeschenite. 

 This mineral, which was also discovered and brought from 

 Siberia by Mr. Menge, and at first considered by him as 

 gadolinite, has been analysed by Hartwell, and named by 

 Berzelius ; but as far as I can discover, not otherwise described 

 than by a very imperfect notice given by Mr. Levy in the first 

 volume of the present series of the Phil. Mag. p. 27. Some de- 

 tached crystals I have lately obtained have enabled me to give 

 the annexed figure and measurements, as taken from rough 

 planes by the common goniometer. 



M,M' = 127° 

 M,A = 116 30' 

 M,e = 169 18 

 h.c = 143 



Assuming the symbol of the plane e to be B, c is E, and a 



terminal 



