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  2. Pleochroism - Wikipedia

    en.wikipedia.org/wiki/Pleochroism

    Pleochroism is an extremely useful tool in mineralogy and gemology for mineral and gem identification, since the number of colors visible from different angles can identify the possible crystalline structure of a gemstone or mineral and therefore help to classify it. Minerals that are otherwise very similar often have very different pleochroic ...

  3. Ametrine - Wikipedia

    en.wikipedia.org/wiki/Ametrine

    It is a mixture of amethyst and citrine with zones of purple and yellow or orange. Almost all commercially available ametrine is mined in Bolivia. The colour of the zones visible within ametrine are due to differing oxidation states of iron within the crystal. The citrine segments have oxidized iron while the amethyst segments are unoxidized.

  4. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    Amethyst has a good hardness, and handling it with proper care will prevent any damage to the stone. Amethyst is sensitive to strong heat and may lose or change its colour when exposed to prolonged heat or light. Polishing the stone or cleaning it by ultrasonic or steamer must be done with caution. [42]

  5. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Prasiolite, an olive colored material, is produced by heat treatment; [68] natural prasiolite has also been observed in Lower Silesia in Poland. [69] Although citrine occurs naturally, the majority is the result of heat-treating amethyst or smoky quartz. [68] Carnelian has been heat-treated to deepen its color since prehistoric times. [70]

  6. Prasiolite - Wikipedia

    en.wikipedia.org/wiki/Prasiolite

    Prasiolite is a rare stone in nature; artificial prasiolite is produced from amethyst. [4] Most amethyst will turn yellow or orange when heated, producing heat-treated amethysts which are often marketed as citrine, but some amethyst will turn green when treated.

  7. Amazon Reviewers Love This Beautiful Amethyst Healing Stone - AOL

    www.aol.com/amazon-reviewers-love-beautiful...

    Amethyst Healing Crystal Amethyst has long been known to relieve anxiety and overactive thoughts. Combine the stone with the powerful phrase "This too shall pass" and you've got a no-fail gift ...

  8. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    The occidental amethyst is of the silex family and is different in composition from the oriental stone. But the identity of names is accounted for by the identity of colour. The occidental amethyst is easily engraved and is found in a variety of sizes. Its shape is different from the round pebble to the hexagonal, pyramid-capped crystal.

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