SOME OCCUE"RENCES OF PIEDMONTITE IN JAPAN. 309 



various slides convinced the writei- that the mineral was true Pied- 

 montite, and not a Tourmaline, and the analysis given above has fully 

 confirmed the writer's view. 



Geographical Distribution of Piedmontite, 



The mineral Piedmontite is not of common occurrence. Treatises 

 on mineralogy recognise up to the present only two typical localities; 

 the one in St. Marcel near Aoste in Piedmont, Italy, where it occurs 

 as a rare mineral together with other manganese ores, and the other 

 in Jacobsberg, in Wermland, Sweden, where it is found localized 

 within a limestone. In both cases, as it seems to me, Piedmontite 

 comes as a rare mineral, and by no means abundant enough to form 

 an independent rock. 



The occurrence of it in Japan is something remarkable, and finds 

 scarcely its equal in other parts of the world. The Manganepidote 

 forms with Quartz the Piedmontite-schist, and is an accessory com- 

 ponent in the Glaucophane-schist.('f) Geologically speaking, its occur- 

 rence is confined to the same horizon as the Glaucophane-rock, i. e. 

 the lower part of Chlorite-Sericite-Gneiss. This imique Piedmontite- 

 bearing rock is unexpectedly of a wide distribution, constituting 

 indeed an essential member in the archaean complex of Japan. The 

 subjoined are some out of many of the typical localities of the 

 Manganese epidote in our country : — 



1. Otakisan, near the city of Tokusima, A^va pi'ovince. 



2. Bessi mine, in Uma Göriji^^) Sanuki province. 



3. Chihara copper mine, in Siüfii Göri ; Kitanada, in Kami-ukina 

 Göri; Uchinoko, and Kaya, in Kita Göri, lyo province. 



(i) Joarn. Sei. Imperial University, Tokyo, Vol. I, Part I, B. Koto, 'A Note ou Glancophane,' 

 p. 85 et seq. 



(a) Gôvi or Kôri is synonymous with " Kreis " or a township. 



