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2. Crystal healing - Wikipedia

   en.wikipedia.org/wiki/Crystal_healing

   Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Adherents of the practice claim that these have healing powers, but there is no scientific basis for this claim.

3. Rutilated quartz - Wikipedia

   en.wikipedia.org/wiki/Rutilated_quartz

   Rutilated quartz used as a gemstone. Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black.

4. Rutile - Wikipedia

   en.wikipedia.org/wiki/Rutile

   The main uses for rutile are the manufacture of refractory ceramic, as a pigment, and for the production of titanium metal. Finely powdered rutile is a brilliant white pigment and is used in paints , plastics , paper , foods, and other applications that call for a bright white color.

5. Theurgy - Wikipedia

   en.wikipedia.org/wiki/Theurgy

   Keith Thomas: "Spiritual magic or theurgy was based on the idea that one could reach God in an ascent up the scale of creation made possible by a rigorous course of prayer, fasting and devotional preparation." [6] Pierre A. Riffard: "Theurgy is a type of magic. It consists of a set of magical practices performed to evoke beneficent spirits in ...

6. Gemstones in the Bible - Wikipedia

   en.wikipedia.org/wiki/Gemstones_in_the_Bible

   Onyx is a variety of quartz analogous to agate and other crypto-crystalline species. It is composed of different layers of variously coloured carnelian much like banded agate in structure, but the layers are in even or parallel planes. This makes it well adapted for the cutting of cameos and was much used by the ancients for that purpose.

7. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...