Crystal Quartz
Crystal Quartz has been around since prehistoric times, and the Greeks named it "crystal," or ice, from krystalos believing it to be a form of the latter, irreversibly frozen by some process of extreme cold. An abundant gemstone, it was frequently faceted as beads and stones in antique jewelry. It is also used a great deal in the manufacture of lamps and lenses. The name Rock Crystal emerged in the late Middle Ages to differentiate it from the newly perfected colorless glass, to which the name crystal or crystal glass had become attached. Quartz is a silicon dioxide, the third most common mineral in the Earth's crust after ice and feldspar. The name "quartz" comes from Old German. Rock crystal is commonly regarded in shamanistic practice as a "light-stone," an instrument of clairvoyance representing a level intermediate between the visible and the invisible. It is believed to aid in concentration and unlocking memory.
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