Piaski szklarskie południowego Roztocza
Abstract
QUARTZ SANDS IN THE SOUTH ROZTOCZE
Summary
Field works and laboratory examinations demonstrate that in the South Roztocze area are found quartz sands useful for glass industry. These sands occur in a series of sandy deposits of Upper Tortonian age, where they make from 52 to 100%. They are fine-grained and feebly rounded, showing an admixture of medium-grained and coarse-grained grains the participation of which, at the exposures examined amounts to 9,2 - 35,4%. Under natural conditions they make glass sands referred to classes 6,5 and 4. After a dressing they can be changed into the glass sand of 2, arid probably of 1 class. It has been ascertained that among the impurities of these sands iron oxides, related mainly to the fraction below 0.1 mm and occurring in the form of surface impurities on the quartz grains, strongly decrease their quality.
Summary
Field works and laboratory examinations demonstrate that in the South Roztocze area are found quartz sands useful for glass industry. These sands occur in a series of sandy deposits of Upper Tortonian age, where they make from 52 to 100%. They are fine-grained and feebly rounded, showing an admixture of medium-grained and coarse-grained grains the participation of which, at the exposures examined amounts to 9,2 - 35,4%. Under natural conditions they make glass sands referred to classes 6,5 and 4. After a dressing they can be changed into the glass sand of 2, arid probably of 1 class. It has been ascertained that among the impurities of these sands iron oxides, related mainly to the fraction below 0.1 mm and occurring in the form of surface impurities on the quartz grains, strongly decrease their quality.