the Composition of Peridot. S59 



a small, and sometimes a merely impalpable trace of gypsum 

 remained undissolved. I must still remark that by this process 

 I ascertained the presence of lime only in the varieties of the 

 peridot, as will afterwards be shown. In accordance with 

 the experiment just described, the following peridots were 

 analysed. 



outline from the top of a moimtain in Silesia "which is covered 



with s7io'w. 



The analysis made with 1-705 gr. as stated, of the dried 

 pulverized stone, produced 



Oxygen. 



Silica 4.1-54. 21-60 



Magnesia 50-04. . . . 19-371 _9i.q. 



Protoxide of iron 8-66. . . 1-97/"" 



Protoxide of manganese . . 0-25 

 Alumina 0-06 



100-55 



Olivine froin Bohemia. 



The analysis made with 1-292 gr. 



Oxygen. 



Silica 41-42 21-54 



Magnesia 49-61 . . . 19-20 \ _o,.oa 



Protoxide of iron 9-14. . . 2-08 J ~ 



Protoxide of manganese . . 0-15 

 Alumina 0-15 



100-47 

 Olivine from the district le Piiys in the Vivai^ais. 

 For the experiment 1*601 gr. were used. 



Oxygen. 



Silica 41-44 21-55 



Magnesia 49-19 . . . 19-04 ) _«, og 



Protoxide of iron 9-72. . . 2-21 j ^ 



Protoxide of manganese . . 0-13 



Lime 0-21 



Alumina 0-16 



100-85 

 TTie mineral resembling olivine in the meteoric iron of Pallas. 



For the determination of its specific gravity a pure piece 

 weighing 1-5585 was chosen; the specific gravity was at 

 62-6 F.-= 3-362. 



Silica 



