Quarz#

Quartz, mineral, SiO2. Quartz, quartzite and quartz sand deposits have been used since the Middle Ages, mainly for glass production. Currently, only high-quality quartz sands are used for the production of glass, while ordinary quality quartz sand and quartzite serve for building materials and metallurgical purposes. In 1993 the Austrian mining authority supervised 100 quartz sand pits and 14 quartzite quarries; production totalled 4,301,625 tons of quartz sand and 429,446 tons of quartz and quartzite.