260 K. jiMBo : 



quite parallel to one-another ; numerous oblique faces on the 

 lateral sides are therefore of no definite direction. This mica 

 is nearly uniaxial. Analysis by Kodera gave 



99.19 



100. Zinnwaldite (?), Muscovite (?), &c. 



Tanokamiyama in Omi. — In the pegmatite of this place 

 there are found, together with the above mentioned biotite, 

 various light-coloured micas as follows : 



a.) Reddish-brown, light brownish-grey to nearly colourless 

 plates, sometimes 15 cm. in diameter. On cleavage surface, there 

 are numerous foldings parallel to the lines of pressure-figure. 

 Fulmchi has distinguished with a contact goniometer, coP^ oP, 

 coPoD, -IPà, -|P, coPœ, cfec. He regards the many re-entrant 

 angles on the sides as casts of other minerals found in intergrowth. 

 A parting parallel to P is sometimes observed. Twins are quite 

 numerous. The optical plane is parallel to the symmetry 

 plane ; the angle of optical axes is large. With a blowpipe, one 

 can distinctly observe the flame-colour of intense red ; but an 

 analysis by Kodera is as follows : 



