This 2018 pricing (Page two here https://medcraveonline.com/MSEIJ/MSEIJ-02-00074.pdf)
This posted in an earlier thread.
This is Sept 2020 report to the sec.
https://www.sec.gov/Archives/edgar/data/1497649/000157570521000061/gstx_10k.htm
Some market information nested in this sec report.
Three HPQS Producers: United States, Norway and Russia. There are only three commercial scale high purity quartz sand factories with the capability of processing HPQ raw quartz into commercial grade high purity quartz sand. They are located in the United States, Norway, and Russia; they collectively produce less than 60% of the increasing global demand for high purity quartz sand. High purity quartz sand currently sells for US$8,000 to US$10,000 per ton with fluctuating pricing according to supply and demand. We can manufacture solar grade high purity quartz sand at a cost of US$2,000-$2,500 per ton. The global market price is predicted to keep increasing due to the ongoing global shortage of high purity quartz sand sufficient to meet the increasing demands of the burgeoning solar and high-end electronics and micro-electronics industries. We have previously operated a research design and a pilot plant production facility in Melbourne, Australia for six years primarily to create new and innovative cost-effective techniques for producing high purity quartz sand applications. .....
So we are talking about quite the logarithmic price if we are talking about 99.95+% (which doesn't come naturally - and wholly depends on energy intensive (nano) purification processes.). However something a like a "basic" (but large scale) beneficiation process, will remove any of the impurities, and get a 99% grade, before either being used as is, or again a further process.
(20min delay)