NOEES ON THE MINERALS OF JAPAN. 219 



Other occurrences of stibnite are the provinces Hyûga, 



KlI, &G. 



14. Bismuthinite (?). 



A fine needle-shaped aggregate of grey colour, rarely found 

 with bismuth, fahlore, &c. in the silver veins of Ikuno in Tajima 

 is probably of this mineral. 



15. Molybdenite. 



Six-sided platy crystals as well as irregular plates (some- 

 times attaining 6 cm. in length) of this mineral are found in the 

 provinces Izumo, Echiqo, Hida, &c. The small plates about 

 0.5 cm. in diameter, found in the crystalline limestone of Kamioka 

 in Hida, are very pretty. 



16. Zinc-blende. 



Ko mentioned the occurrence of beautiful and large crystals 

 (sometimes more than 7cm. in diameter) of zinc-blende in the mines 

 of KuRATANi in Kaga Province, of Ani and Arakawa in Ugo 

 Province, of Osaruzawa in Kikuchû Province, of Adakai in Izu- 

 mo Province, &c. The crystal faces are usually only ±^ and co O, 

 but specimens from Ani, which sometimes exceed 4 cm. in 

 diameter, also often shows co O co, &c. Polysynthetic twins on 

 O are quite numerous at Ani and Kuratani, while similar twins 

 of usually two or three individuals occur at the Uchinokuchi 

 mines in Bungo Province. AVada possesses a druse of tetra- 

 hedral zinc-blende crystals, about 1 cm. in diameter and brought 

 from the Daira mines in Ugo Province. The edges of the 

 tetrahedra are beveled with go O co, and the solid angles with 

 very small faces of negative tetrahedra. 



All the above-mentioned localities of zinc-blende usually 

 give the dark-brown to brownish-yellow varieties. 



