NOTES ON THE MINERALS OF JAPAN. 241 



P2, &c. The colour is brownisli to bluish or quite colourless. 

 A beautiful tabular crystal of colourless barite from Aikawa, 

 (Watanabe's collection) measuring about 6 cm. in length and 

 showing the combination ^F. ccp. œP œ. P u^. P cc. ÄP œ, 

 is marked on ^p with fine striations parallel to the a and b 

 axis, as well as to the edges of combination of oP with x P. 



KosAKA in Rikuchu. — Small tabular colourless crystals, 

 (oP. Pœ. -i-P^. œPœ. Fœ. IF>/.. ooPœ) are here found in 

 metallic veins. 



Besides, we find, according to Ko, good crystals of barite 

 from TsuBAKi, Daira and Yatsumori in Ugo, Karuizawa 

 in Fukushimaken and Ponshikartbets in Shiribeshi Pro- 

 vince. 



Pseudomorphs of the Aikawa and Arakawa mines. — 

 The curious quartz aggregates of the former locality, occuring 

 in the shape of thick rliombic tables witli rounded edges, are 

 found to be probably a pseudomorph. 



Those of the Arakawa mines are of five different habits. 

 The first kind is in the form of nearly rhombic tubes with 

 drusy quartz on their inner as well as outer walls. These 

 are most probably quartz-envelopes, on prismatic barite crys- 

 tals, which were dissolved away afterwards. The quartz indivi- 

 duals on the surface are of course later accretions. The second 

 kind of the pseudomorph is a compact quartz-mass Avith cavi- 

 ties left after the dissolution of barite crystals. Its Avails are 

 casts of prismatic faces of two different indices, and show minute 

 striations. The bottom is perpendicular to these walls. While 

 the tubular pseudomorphs sometimes measure 18 cm. in length, 

 the above mentioned cavities are much smaller in dimension. 

 The third kind is represented by casts of rhombic tables of barite. 



