222 K. JiMBo : 



irregular rounded aggregates iu the clay of Kamtshina in Shinano 

 are either pyrite or marcasite. 



20. Arsenopyrite. 



Ko mentioned the occurrence of nearly perfect crystals of 

 arsenopyrite (ooP. ^Pco) in the mines of Kuratani in Kaga, 

 FuTTO in Mikawa, Kamioka in Hida, Sasagatani in Nagato, and 

 KoHAGi and Ban do in Echizen. Twins are quite numerous at 

 Kuratani and Futto. 



Among the small perfect crystals of arsenopyrite from 

 AwASHiRO in Mikawa, Fukuchi found many twins on coP and 

 those on Pœ, besides simple individuals ( '^ P. iPœ). There are 

 also found trillings on P ^. 



21. Galena. 



Pretty crystals with bright faces, usually showing only O, 

 00 O 00 and GO O are found in the mines of Kuratani in Kaga 

 and of Ani in Ugo. The crystals from the former locality with 

 prevailing O and subordinate go O oo are often rounded on edges, 

 holed on O, and covered with microscopic etching figures. A 

 peculiarly zonal appearance is observable on account of this 

 natural etching, which had produced indistinct terraces on the 

 almost smoothly rounded crystal edges. 



22. Argentite. 



Wada possesses octahedral (?) crystals of this mineial from 

 the mines of Aikawa in Sado and of Innai in Ugo. Their 

 faces are really very hard to determine. Kanagase in the 

 Ikuno mining district in Tajima gives, though rarely, imperfect 

 crystals of argentite. 



