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|Title:||Studies of Glass Sands Occurring Around Shankargarh, District – Allahabad with Reference to its Economic Viability|
Tiwari, R N
|Keywords:||Glass sands;Silicate glass;Economic viability|
|Abstract:||The present paper deals with the glass sands occurring around Shankargarh, district Allahabad. The sands in the area are predominantly whitish. However, other colours viz., pink, light yellow, yellow, brown, and red are also commonly found. More than 60 samples representing the vertical and lateral variations of the lithological units were collected from different parts of the area for grain size, mineralogical and geochemical analyses. The grain size analysis reveals that the majority of the grains are rounded, coarse to fine size grade, well sorted, finely skewed and platykurtic. Mineralogical study of the selected glass sand samples shows the presence of light minerals, i.e. , quartz, mica, and chert and heavies-rutile, staurolite, tourmaline, and zircon. Opaques include magnetite and ilmenite. Geochemical analysis of these sands reveals a variation in SiO2 inbetween 97 per cent and 99.01 per cent, whereas Fe2O3 from 0.14 per cent to 1.41 per cent and Al2O3 0.12 to 1.89 per cent. The percentage of iron decreases with the increase of depth, thereby at the base white glass sand of purest variety is met with. Impurities in the form of iron oxide, glistening specks of mica, etc., have been observed in the glass sands. By treatment and beneficiation, iron, and aluminium contents of the glass sands of the area can be reduced for the purpose of making colourless glass. These sands can also be used for making the different types of glass, i.e., lime glass, lead glass, and silicate glass. The glass sands in the area have been found under thin cover of soil with a gentle ground slope. This has provided more time and opportunity for the rain water to percolate through and thereby facilitate the disintegration of the parent rock in the dry summer season.|
|ISSN:||0975-1084 (Online); 0022-4456 (Print)|
|Appears in Collections:||JSIR Vol.62(09) [September 2003]|
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