NOTES ON THE MINERALS OF JAPAN. 279 



99.9 

 Heulandite occurs, besicles, at Sasebo in Hizeii (accordiDg 

 to Ko), at Maze in Ecliigo (according to Takimoto), &c. 



128. Chabasite. 



OsAWA in Nikkö. — Saitö has described the following 

 characters of chabasite from this locality : 



Crystals found in druses, more or less tainted with a brown 

 ferruginous substance. Their diameter is about 1 or 2 cm. 

 Numerous twins on R and a comparatively few supplementary 

 twins are observed. Crystal faces are R and -iR, with - 2R 

 in some individuals. Triangular section parallel to oP is divided 

 into six fields which are often quite irregular in boundaries. 

 The corresponding chief sections of two fields lying on one of 

 the corners of the section make an acute angle, opening towards 

 that side of the triangle wdiich is opposite to this corner. Sec- 

 tions parallel to R show a division into two fields, with inserted 

 twin-lamellœ. 



MiTAKA in Izu. — M. Yamashita has studied minute colour- 

 less crystals of chabasite in a fresh greenish-grey coloured 

 rock. Their diameter is only about 0.5 cm. Optical character 

 is nearly like that of the Osawa specimens ; but good sections 

 parallel to oP are very difficult to prepare, for the crystals are 

 usually attached to rock by their lateral solid angles. 



Other localities of chabasite is in the province Hizen, &g. 



