160 Watanabe — Babingtonite from Japan. 



When the babingtonite vein traverses magnetite or 

 ilvaite, it assumes a shape of a regular vein, but as it cuts 

 hedenbergite, babingtonite often replaces a part of heden- 

 bergite on both sides of the fissure, and still preserves the 

 original texture. 



In short, the formation of the babingtonite in the 

 Yakuki mine seems to have commenced at a certain stage 

 of the formation of skarn masses, and to have continued 

 after the brecciation of the skarn and lasted to some 

 stages of fissure, filling deposition of quartz and calcite. 

 Throughout the whole duration, the mineral is most inti- 

 mately associated with garnet. 



Crystallography. 



The isolated crystals were picked out from the speci- 

 mens, in which the mineral is embedded in calcite, and 

 were measured by means of a Czapski two-circle goni- 

 ometer. 4 Most of these crystals are very small, rarely 

 exceeding 2 or 3 millimeters in dimension. Besides, the 



Table I. 















Measured 









Calculated 5 







(mean) 





Faces 



4 





/ 



3 







p 





c 001 



124 c 



24' 



4° 



36' 



125° 



50' 



4° 



49' 



o 010 







00 



90 



00 







00 



90 



00 



a 100 



67 



48 



90 



00 



67 



57 



90 



00 



h 110 



24 



42 



90 



00 



24 



12 



90 



00 



£210 



115 



24 



90 



00 



115 



25 



90 



00 



k 110 



143 



38 



90 



00 



143 



37 



90 



00 



o 011 



4 



07 



42 



48 



4 



06 



42 



38 



s 011 



176 



15 



45 



29 



177 



33 



43 



33 



d 101 



73 



49 



32 



39 



74 



02 



32 



42 



n 101 



-119 



12 



28 



55 



-120 



17 



29 



04 



p 111 



28 



11 



52 



29 



28 



40 



52 



55 



; 102 



-127 



07 



14 



39 



-127 



30 



15 



15 



I 201 



-115 



26 



49 



59 



-115 



50 



49 



25 



q 111 



-34 



17 



40 



25 



-33 



45 



41 



25 



z 023 



174 



31 



34 



48 



175 



02 



34 



29 



4 This study was done through the courtesy of Professor A. F. Eogers 

 of Stanford University, Calif., to whom the writer offers his sincere thanks. 



5 The calculations of the co-ordinate angles were made mainly according 

 to the formulae given by A. J. Moses and A. F. Eogers (School of Mines 

 Quarterly, vol. 24, No. 1, 1902), and partly by the method, proposed by H. E. 

 Boeke (Die Anwendung der stereographischen Projektion bei kristallogra- 

 phischen Untersuchungen, 1911, pp. 41-46). 



