94 B. KOTO 



manganese-epiclote^) are clistinctly visible in long needles Avith 

 unsymmetrical wedge-shaped terminations at botli ends, trans vertally 

 fissured, sometimes pushed asunder into several portions ; in other 

 cases the piedmontite is bent like crystals of tourmaline or common 

 epidote. The best exposure is found along the banks of the 

 Ara-kawa river near the village Minano, or nenr Otakisan in Awa. 

 Clusters of needles may often be seen together with quartz-nests 

 as at Miyanosavva near Obata, or at Kamakata near Ogawa. It is 

 not easy, however, to get out a good sample, as they are so intimately 

 imbedded in the quartz-aggregate. 



The components of the piedmontite-schist are (besides the 

 manganese-epidote) quartz, sericite, a greenish-yellow garnet, rutile, 

 non-striped felspars, and the blood-red iron-glance. On account of the 

 parallel position of the piedmontite-aggregate with layers of quartz- 

 grains, transverse sections of the rock jtresent a regular banded 

 appearance. The clinopinacoidal section of the mineral is of rhom- 

 boidal outline, caused by the predominance of the traces of T and i, 

 and when the face M is at the same time well develo])ed, the 

 section is six-sided. Parallel growth and inter<xrowth of two or 

 more individuals of different sizes may be found everywhere, and 

 tliese are the main causes of striation upon the crystal-faces in the 

 direction of the axis of symmetry (ortho-axis). The colour of the 

 piedmontite is deep ^dolet, and often yellowish-brown. A jjrobable 

 explanation of the considerable difference in colours has been given 

 in a separate paper (Kjc. cit.). Axial colours are: — 5( = deep-violet ; 



1) Prof. A. Stelzner, of the ' Bergakademie/ Freiberg in Saxony, has favoured the writer 

 with a few lines, dated 30th July, of this year, after receiving my paper on 'Some 

 Occurrences of Piedmontite in Japan/ (this Journal, Vol. I, Part III,) which run as follows : 

 "Die Arbeit ueber Piedmontit interessirte mich um so mehr als Sie das bestätigte, was 

 ich an einem Gesteine vom Gebirgsrücken zwischen Tatsikawaundder Besschi-Kupfergrube, 

 Provinz lyo beobachtete. Wir hielten das Gestein für einen Thulitschiefer— aber ihre 

 Bestimmung wird wohl die richtige sein/' 



