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Quartz — SiO2

Natural quartz is a widespread mineral and one of the base components of the rocks.

It was Theophrastus Paracelsus and then Pliny who firstly mentioned quartz considering it to be a petrified ice.

There are few versions of the word “quartz” origin:

  1. From the Saxonic “querkluflertz” that means cross-section veins to German “querertz” than to modern “quarz”.
  2. From the proto-Celtic name of crystal quartz mineral “cross-course-spar”.
  3. From Vends language “twardy” meant firm, hard.

However, Irish language calls quartz “grian cloch” and this means sun stone.


The types of natural quartz

The scientists distinguish several types of quartz minerals depending from crystal structure: b- christobalite, b-tridymite, a-quartz, b-quartz, b1-tridymite, a-tridymite, a-christobalite, coesite, stishovite, keatite. Meantime there are only few of them in nature. The most common type of quartz is so called ?-quartz and that is the sort we are extracting from the ore in Kyshtym

Crystals and grains of natural quartz may have various colors: the most common are colorless, milk or grey. Clear or limpid quartz with color gradations have different names: transparent, clear is called rock crystal, violet – amethyst, smoke-colored – rauchtopas, black – morion, golden yellow – citrin. The agate and chalcedony are cryptocrystalline form of silica consists of very fine intergrowths of the quartz and some other minerals in the crystal body.

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