238 K. JiMBü : 



53. Rhodocrosite. 



Pretty rhombolieclral crystals of this mineral, about 1 cm. 

 in diameter, are found in the silver mines of Ponshikaribets 

 in Shiribeshi Province. Flattened forms of rhombohedra as well 

 an peculiar saddle-shaped specimens are found in the Kuratani 

 mines. 



54. Siderite. 



Good crystals of siderite are found in the Omori mines in 

 IwAMi Province, while saddle-shaped small individuals of it are 

 collected at the Uchinokuchi mines in Bungo Province. 



Siderite in the form of dark brownish-grey cylindrical 

 bodies is found in the gravel deposit of Shtbuya near Tokyo, 

 and was described by Ogawa as a pseudomorph of decayed plant- 

 roots. 



55. Aragonite. 



Taiea in Shinano Province. — On a tributary of the upper 

 part of the river Takasegawa flowing through the village of 

 Taira, there are numerous small pits from which hot sulphur- 

 ous water issues. On the sides of these solfataras, there are 

 remains of huge sinter-cones still preserving central and 

 secondary openings of former hot springs. In some of the 

 now active pits of sulphurous water, are sometimes collected 

 beautiful white-coloured small balls and irregular lumps of 

 aragonite. These balls are also found in the shape of aggregates 

 on parts of old sinter cones, where they usually have dirty-grey 

 colour. 



A complete series of transition could be traced from nearly 

 perfect spheres to curious dodecahedral grains of the aragonite, 

 through such spheres as are supplied with one or more depres- 



