NOTES ON THE MINERALS OF JAPAN. 271 



100.30 99.52 



The first sample was taken from a simple individual with an 

 opaque-white internal part, and the second from a Carlsbad twin 

 also with an opaque-white core. All the specimens, from which 

 samples were taken for the above four analyses, are in Wada's 

 collection. 



Crystal faces in the varieties a, b and c of the potash felspars 

 of Tanokamiyama are 00 P cb, oP, œ P, co p^^ p^ P ^^ 2P ^ and 

 2Pcb; besides (according to Ko), œ P œ, found only in a and b. 



