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INDEX. PAET I. Age of Auriferous veins, 163 “ Gold bearing rocks,.... 164 “ Granite, 65 Age of Pyrocrystalline rocks de duced from crystallization,. .. Agency of Water, 15-20 Albite, composition of, 47 Analcime, composition of, 52 Appalachian range, 28 Area of land 11 “ Atlantic Ocean, 11 “ Pacific Ocean, 11 Auriferous and copper lodes,... 166 Basalt, 108 Causes of volcanic action, 117 Changes in a vein, 137 Chert, 160 Chondrodite, composition of,.. 58 Classification of rocks, 43 Clay slate, 104 Chlorite, 104 Congdon vein,. 168 Continuity of veins, 130 Copper mines of Lake Superior, 171 Copper in Hornblende, 173 Currents 20 Direction of veins, 162 Distribution of Granite,.... 67-71 Distribution of Pyrocrystalline rocks, 105 Distribution of Pyroplastic,.... 109 Distribution of Auriferous rocks, 165 Dolerites, 49 Earth’s crust, 40 Elements of Granite, 47 Epidote, composition of, 49 Expenses of mining operations, 183 Feldspar, composition of, 49 Fentriss coppermine 167 Fire, action of, 35 Glaciers, 24 Gneiss, 99 Gold bearing rocks, 155 Good veins, indications of,.... 136 Green Mountain range, 28 Groups of Pyrocrystalline rocks, 49 Graystone composition, gravity of, 50 Gravity at the Moon’s surface,.. 119 Heulandite, composition of,.... 52