264 



B. KOTO. 



the form of an intricate felt-work of fine prismatic crystals, appearing 

 not unlike the needles of sillimanite. Only a little feldspar is found 

 as a o-runular, weakly polarizino; aggregate, in which actinolite is rare. 

 The general ninss is full of tea-brown, hexagonal tablets and grains 

 of opaque iron gin nee. 



d) The next in ascending order, and forming the basement of the 

 temple of Gozaisho, is a schist which not only differs in its external 

 aspect but i\ho in its minerulogical composition from those of the 

 preceding rocks. The appearance itself suggests at once that the rock 

 has suffered a great physical change by dynamic metamorphism to 

 siich an extreme degree, that the zones of feldspar, now appearing dull 

 and saussuritic, have been so torn and convulsed as to assume a puckered 

 aspect. The rock is finely crystallo-granular, massive and slightly 

 fissile, and imperfectly banded with milky-white, feldspar zones. 



The microscope reveals that the schist is composed of a bluish-green 

 hornblende, dirty, greenish-brown biotite, crystals and grains of 

 magnetite, all arranged in parallel lines, and lapped over by thin 

 flocculent chlorite. A transverse section of the rock admirably discloses 

 the UK^de of arrangement in full detail. A greyish-green biotite and 

 the dust of magnetite togethei- make up special bands, running through 

 the rock and fl(jwing around the aggregates and sometimes large, 

 well-defined crystals of magnetite. Above and below, the band is 

 bordered witli an accumulation of magnetite, whence the bluish -green, 

 sheaf-like hornblende shoots forth in different directions into the fine 

 aggregate of white, feldspar zones. Some feldspar occurs in the shape 

 of large, irregular grains forming veinules within the microcrystalline. 

 mosaic of the same mineral. The feldspars are limpid, but some show 

 traces of alteration, and are traversed by in;iny fissures and chains of 

 liquid-inclusions with air-bubbles, in a direction at right angles to the 

 plane of schistosity of the rock. 



