 ... sizes of finished products made from optical fluorite 421 INTRODUCTION Fluorite, or fluorspar as it is commonly called, is a mineral of rather limited occurrence, used in bulk in this country in the manufacture of steel, hydrofluoric acid, enamels,...  Bulletin - Page 711927Full view - About this book
 | 1918 - 988 pages
...acid and enamels. In addition clear, colorless, or faintly colored specimens, such as occur sparingly with the crude material, are suitable for the manufacture...of certain types of lenses and prisms employed in optical instruments. Optical fluorite of excellent quality has been found in southern Illinois, and... | |
 | Illinois State Geological Survey - 1922 - 492 pages
...manufacture of steel, hydrofluoric acid, enamels, glazes, and for a few other purposes. In addition, clear, colorless, or faintly colored specimens, such...western Kentucky, but centering in Hardin County, Illinois, the availability for optical use of the product from this region has heretofore been neglected,... | |
 | Illinois State Geological Survey - 1922 - 490 pages
...manufacture of steel, hydrofluoric acid, enamels, glazes, and for a few other purposes. In addition, clear, colorless, or faintly colored specimens, such...western Kentucky, but centering in Hardin County, Illinois, the availability for optical use of the product from this region has heretofore been neglected,... | |
 | 1922 - 490 pages
...manufacture of steel, hydrofluoric acid, enamels, glazes, and for a few other purposes. In addition, clear, colorless, or faintly colored specimens, such...western Kentucky, but centering in Hardin County, Illinois, the availability for optical use of the product from this region has heretofore been neglected,... | |
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