Obsidian ites. 439 



I. II. 



SiO., - 7092 TT82 - 71.14 1.186 

 A1„0, - 12.20 .120 - 11.99 .117 



Total - 101.09 99. r 



Sp. Gr. - 2.447 2.43 



I. — Billitonite from Telirung, Dendang. Analysed by.C.v. John. 

 II.- — ^Billitonite from Lura Mijn, No. 13, Dendang. Analy.sed 

 by Dr. Brunck. 



The following are the norms, calculated from these analyses: — 



1. II. 



Quartz - - 31 4 - 32.0 



Orthoclase - - 15.0 - 16.1 



Albite - - 21.0 - 21.0 



Anorthite - - 14.7 - 13.6 



Diopside - - 3.4 - .7 



Hypersthene - 14.0 - 15.8 



^Magnetite - - 1.6 



Both of these analyses fall into the sub-rang. Almerose, and 

 although difi'ering somewhat fioiii the obsidianites vvhich fall into 

 this group the general resenil)laiice is very marked. 



Six analyses, quoted by Dr. Suess, of Moldavites are capable of 

 classitication. All these analyses were madel)y C. v. John, Vienna. 

 I. II. III. IV. V. VI. 



Total - 99.94 100.15 99.46 100.49 100.04 100.49 



