Victorian Igneous Rocks. 261> 



gauous (ixide is added to the ferrous oxide. These recalculated 

 analyses, together witli tliusc of the Macedon Rocks, are given in 

 Tal)le \'.. arranged in order of increasing silica percentage. 



TABLE V. 

 I. II. III. IV. V. VI. VII. VIII. i.x. 



SiO., - 62.59 62.64 63.29 64.06 65.90 66.04 68.61 69.33 70.17 



AloOa - 16.65 16.62 16.86 16.71 16.03 15.46 16.31 15.35 13.63 



FeO - 7.26 6.91 6.56 



MgO - 3.09 2.70 2.71 



CaO - 4.60 4.30 3.97 



Na,0 - 2.29 2.99 2.69 



K^O - 2.16 2.57 2.50 



TiO., - 1.17 1.10 1.22 1.31 0.82 0.92 0.86 0.70 0.52 



P^O,-. - 0.19 0.17 0.20 0.15 0.19 0.22 0.09 0.19 0.18 



Totnl - 100.00 lOO.(X) 100.00 100.00 100.00 100.00 100.00 100.00 lOO.OO 



eiO., - 70.73 71.24 71.29 72.29 72.88 73.30 73.89 76.34 76.37 



AI263 - 14.08 14.04 14.52 13.72 14.81 13.62 13.95 13.16 13.10 



FeO - 3.90 3.34 2.37 



MgO - 1.08 0.80 1.09 



CaO - 2.54 2.36 3.01 



Na^O - 3.05 3.96 3.18 



K^O - 3.61 3.68 3.21 



TiO. - 0.86 .58 1.21 0.46 0.36 0.46 0.20 0.11 0.20 



PjOs - 0.15 tr. 0.12 



Total - 100.00 100.00 100.00 100.00 100.00 100.000 100.00 100.000 100.00 



I. Dacite, Cherokees, Macedon District. 



II. Dacite, Willimigongong Creek, Macedon District. 



III. Dacite, Braeniar House, Macedon District. 



IV. Dacite, Upwey, Mount Dandenong District. 



V. Granodiovite, Braemar House, Macedon District. 



VI. Dacite, Hesket, Macedon District. 



VII. Adamellite, Broadmeadows. 



VIII. Granodiorite, Hesket, Macedon District. 



IX. Adamellite, Trawool, Strathbogie District. 



X. Average of Adamellite and Quartz Porphyrite, Strath- 

 bogie. 



XI. Granodiorite, Harcourt. 



XII. Quartz-porphyrite, Violet Town, Strathbogie District. 



XIII. Adamellite, Ingliston. 



XIV. Granodiorite porphyry, Barringo Creek, Macedon District 



XV. Granite, Gabo Island. 



XVI. Granite, Mount Buffalo. 



XVII. Granite, Dog Rocks, Geelong. 



XVIII. Granite, Cape Woolamai. 



