CONTENTS. 
Part I. 
ECONOMICAL MINERALOGY. 
ORES OF IRON. pagb. 
Magnetic Oxide of Iron,.... 1 
Magnetic Iron Sand,. 22 
Specular Oxide of Iron, . 23 
Lenticular Clay Iron Ore,... 26 
Hydrous Peroxide of Iron,. 29 
Present Condition of the Manufacture of Iron in the State of New-York, . 38 
ORES OF LEAD, ZINC AND COPPER. 
Sulphuret of Lead, or Galena,. 44 
Sulphuret of Zinc, or Blende,... 52 
Sulphuret of Copper, or Copper Pyrites, ...... 52 
Ores of Manganese,. 53 
Titanium and its Ores, ..... 55 
Ores of Arsenic,. 56 
Magnesian Minerals,. 57 
Materials for Brick, Pottery and Porcelain,. 59 
Stone Paints, Ochres, &c. .. 60 
CALCAREOUS MINERALS. 
Hydrous Sulphate of Lime, or Gypsum,. 61 
Marble,..... 67 
Manufacture of Lime,. 74 
Hydraulic or Water Limestone,. 75 
Marl,. 83 
Soils,. 89 
Min. d 
