168 VOLCANIC AREA OF EAST MORETON, ETC., DISTRICTS, Q., 







Chemical Analyses. 









I. 



11. 



III. 



IV. 



v. 



VI. 





Comendite 



Comendite 



Pantellarite 



Pantellarite 



Trachyte 



Monzonite 





(ortho- 

 phyne) 



(ortho- 

 phyric) 



(ortho- 

 phyric) 



(orthophyric 



and fegirine 



bearing). 



(trachytic) 



(Quartz 

 Diorite) 





Loc: Mt. 



Conowrin, 



Glass House 



Mts. 



Mt. Coolum, 

 Yandina. 



Ngun-Ngun, 



Glass House 



Mts. 



Trachyte 

 Range, Glass 

 House Mts. 



Mt.Beerwah 



Glass House 



Mts. 



Mt. Cooroy. 



Si0 2 



7420 



74-78 



72-38 



71-56 



64-58 



62-09 



A1 2 3 



11-75 



11-94 



12-21 



11-94 



17-52 



14-45 



Fe 2 3 



1-92 



2-46 



3-36 



4-68 



2-56 



3-46 



FeO 



1-30 



•88 



•69 



•46 



•96 



4'00 



MgO 



•30 



•16 



•17 



•32 



•22 



•94 



CaO 



•19 



•07 



•18 



•28 



•39 



3-15 



Na 2 



4-25 



4-77 



3-52 



4-88 



6-41 



4-45 



K 2 



5-00 



3-99 



5-20 



5 03 



6-23 



4-56 



H 2 + 



•27 



•28ig 



■86ig 



•40 8 



•30 



•34ig 



H 2 0- 



•06 



•19 



■69 



•33 



•11 



•24 



C0 2 



•01 



n.d. 



— 



— 



•08 



•11 



TiO Q 



•13 



•17 



•25 



•17 



13 



1-30 



Zr0 2 



•38 



— 



— 



— 



•21 



trace 



P 2 s 



abs. 



trace 



trace 



trace 



trace 



•56 



S0 3 



abs. 



— 



— 



_ 



abs. 



— * 



CI 



•17 



— 



•01 



— 



•08 



•05 



F 



02 



— 



— 



— 



— 



— 



S(FeS 2 ) 



•10 



— 



— 



— 



•08 



•05 



Cr 2 3 



abs. 



— 



— 



— 



abs. 



abs. 



MnO 



02 



•08 



•70 



trace 



•08 



•38 



NiO 



03 



•03 



•04 



01 



•03 



•09 



CoO 



abs. 



abs. 



abs. 



abs. 



abs. 



abs. 



SrO 



abs. 



abs. 



abs. 



abs. 



trace 



abs. 



BaO 



abs. 



abs. 



abs. 



abs. 



abs. 



trace 



Li 2 



abs. 



abs. 



abs. 



abs. 



abs. 



abs. 



Sum 



100-12 



99-80 



100-26 



100-06 



99-97 



100-22 



Sp.Gr. 



2-62 



2-70 



2-47 



(vesicular) 



2-71 



2-62 



2-70 



*, Present only in pyrites. 



f, CI from sea water chiefly; removed by washing. 



Note to Chemical Analyses. 

 The analyses were carried out in the Geology Laboratory 

 Sydney University. The evaporations were done in porcelain 

 utensils on account of lack of platinum dishes; and the reagents 

 used, though the best obtainable, were not quite pure. Therefore 

 as a check I made a number of " blank " analyses, and obtained 

 as a mean result of these blanks the following quantity of impurity 

 in the amount of reagents used for each analysis : — SiO„ = "24%; 

 Al 2 O 3 = -07%; Fe 2 :i = -19%; Na 2 = -22%; K 2 O = -07%. 



