198 Watson and Wathms -Association of It utile 'and 



Microscopically the rutile is usually inclosed in the sub- 

 stance of tlu 1 eyanite and to some extent in the quartz, without 



Fig. 2. 



Fig. 2. Photomicrograph of eyanite showing inclusions of rutile crystals 

 (in black). Other occasional light-colored inclusions are shown. Fracture 

 and cleavage in the eyanite are indicated. Magnified 105 diameters. 



orientation. It is sometimes observed formed along the bound- 

 aries of the eyanite and quartz, frequently cutting into their 



