Last Updated: Sep 28, 2016 Views: 580
To be used for glassmaking, sand must contain a very high silica content. The sand should also be relatively free of impurities. According to J. A. Bownocker in "Glass Sands of Ohio"  The American Ceramic Society set specifications for glass sands: https://kb.osu.edu/dspace/bitstream/handle/1811/2296/V26N01_025.pdf;jsessionid=5AC0CCDF32B58E4F0DFC775498F1B5DA?sequence=1
I attached a bibliography of materials relating to this subject, covering sands used in ancient times, European, and American glass sand. Some of the books have been digitized and we provide links to the text.
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