During our trip to Romania this winter I’ve got to learn about a quartz sand quarry not far from the place where we spent most of the time. The sand is industrially exploited by a company called STICLOVAL due to its high purity and suitability for fabrication of glass.

The sands are almost white and have a different content of iron and silica, according to the company’s profile. I was just lucky to receive some samples from different horizons and with different degrees of purity from somebody working in the company – see the numbers 699, 701, 702, and 703: