The most mined mineral in my country is quartz. It is mined deep into the ground. This was one of the first most important company xtrata. . Switzerland export and import a lot of quartz, they export their quartz in more than 100 countries. Quartz is one of the most useful natural materials because it has a hardness of seven on the Mohs Scale which makes it very durable.
Glass Making
Abasives
Foundry sand
Petrolium industry
ruber
paint
potty
watches
railroad mining industries
....and others
The value of quartz depends on it's purity but I found an information saying that in general a diameter cost 30chf . They depend a litle on quartz because switzerland is famous for it's watches and their watches are made of quartz.
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