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  2. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Rose quartz (var.) Rock crystal (var.) Shocked quartz (var.) Smoky quartz (var.) Quartzite; ... Metal-coated crystals hyped as rainbow quartz; Lab spinel; Synthetic ...

  3. 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.

  4. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    A synthetic quartz crystal grown by the hydrothermal method, about 19 centimetres (7.5 in) long and weighing about 127 grams (4.5 oz) Not all varieties of quartz are naturally occurring. Some clear quartz crystals can be treated using heat or gamma-irradiation to induce color where it would not otherwise have occurred naturally. Susceptibility ...

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A chemical powder which corresponds to the desired gemstone is passed through this flames. This melts the ingredients which drop on to a plate and solidify into a crystal called a boule. [64] For corundum the flame must be 2000 °C. This process takes hours and yields a crystal with the same properties as its natural counterpart.

  6. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...

  7. Crystal - Wikipedia

    en.wikipedia.org/wiki/Crystal

    Crystals of amethyst quartz Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called "crystallites" or "grains"); and an amorphous solid (such as glass) has no periodic arrangement even microscopically.

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