BY H. I. JENSEN. 



169 



Chemical Analyses. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 





Porphyrite 



Qtz. Diorite 



Dacite 

 Bankfoot 



Andesite 



Basalt 



Glaucophane 

 Schist. 



Extra Silica 

 Estimations. 



Pt. 

 Arkwright. 



Noosa Head. 



House, 



Glass House 



Mts. 



Eumundi. 



Yandina. 



Mt. Mee. 





59 27 



57-66 



62 15 



54-24 



49-43 



49-98 



Nindherry 



17-80 



21-17 



1673 



15-41 



12-73 



11-95 



Rhyolite. 



2-46 



•05 



2 90 



2-34 



5-06 



13-91 



Si0 2 72-39 



3-39 



5-11 



3 22 



5-92 



8-47 



2-75 





2-39 



1-70 



2-70 



3-31 



6-96 



5-53 





5-39 



6-57 



3-98 



4-84 



8 59 



1054 



Mt. Archer 



4-87 



3-81 



3-58 



3-34 



3-50 



2-63 



Rhyolite. 



2-51 



1-73 



2-81 



2-62 



1-21 



■26 



SiO 2 75-20 



1-18 



1-00 



1-06 



1-67 



I'll 



1-18 





•31 



•05 



•14 



•72 



■73 



•03 





•69 



•11 



•04 



4-44 



•28 



■02 



"Bottle and 



•62 



•88 



•83 



1-57 



2-26 



•80 



Glass," 



•05 



abs. 



trace 



p.n.d. 



abs. 



abs. 



Blackall 



•44 



trace 



p.n.d. 



trace 



■49 



p.n.d. 



Range, 



*■ 



_ * 



— 



— 



abs. 



— 



Pantellarite 



•07+ 



trace + 



trace 



•01 



trace 



trace 



Si0 2 68-72 



•33 



•05 



•11 



•24 



trace 



■23 







abs. 



abs. 



abs. 



abs. 



faint trace 



p.n.d. 



Pt. Arkwright 



•10 



•11 



•12 



trace 



•08 



13 



Aplite. 



•01 



•04 



•08 



•05 



•05 



•10 



Si0 2 69-22 



abs. 



abs. 



abs. 



abs. 



abs. 



abs. 





abs 



abs. 



abs. 



abs. 



abs. 



abs. 





abs. 



abs. 



abs. 



abs. 



abs. 



abs. 



Dark 



abs. 



abs. 



abs. 



abs. 



abs. 



abs. 



Porphyrite 



101-88 



100 04 



100-45 



100-67 



100-89 



100-04 



Pt. Arkwright 

 Si0 2 6ll6 



2-86 



2-78 



2-61 



2-625 



3-18 



3-18 





p.n.d., present in small amount insufficient to warrant determination of amount. 

 — , not determined, ig, determined by ignition. 



The figures given in my table of analyses are the results actually 

 obtained from my weighings minus the average amount of the 

 substance obtained in a blank. To get my actual laboratory 

 results therefore add the above figures to those in the tables. 

 The sum is increased by "79% in each case. 



For each analysis about 1 grm. of rock powder was used, and the 

 appropriate amount of reagents as recommended by Washington 

 and Hillebrandt, whose methods were followed. As closely equal 

 amounts as possible of reagents were used in each case. 



