272 K. jiMBo : 



Deviation of the angle PM from a right angle is sometimes very 

 great ; this may be due to an imperfection in crystal development. 



The Baveno twins are sometimes cyclical and consist of 

 three individuals. A peculiar parallel-growth of two Baveno 

 twins, with a re-entrant angle at their union, is not rare. That 

 of two Manebach twins united on ^ P oo Avith a central depres- 

 sion on one end is also met with, but not often. Albite lamellae 

 in perthitic intergrowth are found in the potash felspar ; the 

 same plagioclase making a parallel growth with principal felspar 

 individuals, also forms crusts and projecting lamellae on the faces 

 of these. 



Naegi, &c. in Mino. — The varieties a and d above mentioned, 

 are found, with the same characters and the same mode of occur- 

 rence, at Naesfi and vicinitv. The chief difference of these 

 Mino crystals is their more decomposed and often opaque porce- 

 lain-like appearance. The peculiar parallel growth of two twin- 

 ning crystals met with in Omi specimens has not been observed 

 in them. 



The form of termination of Baveno twins is of course 

 diflerent with different development of the faces. A specimen 

 in our collection shows a nearly straight truncation. 



Kai. — From a locality in Kai province were formerly 

 brought large, glassy simple felspar crystals, about 9 cm. broad 

 and showing œPœ, oP, œ P, ^ Ps, P, Pô) and iP^. 



Akazu in Owari Province. — White opaque simple crystals 

 are collected at this locality, together with smoky quartz. 



Tadachi in Shinano. — Light-greenish to greenish-grey micro- 

 cline crystals with coP^^ oP, co 'P, co P', cc 'Pï, ^P's, ,P, P„ 

 ,P, CO and 2,P/Cö are collected in pegmatite, and attain a breadth 

 of 7 cm. They occur along with good smoky quartz crystals. 



