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  2. Apatite - Wikipedia

    en.wikipedia.org/wiki/Apatite

    Apatite is infrequently used as a gemstone. Transparent stones of clean color have been faceted, and chatoyant specimens have been cabochon -cut. [ 3 ] Chatoyant stones are known as cat's-eye apatite , [ 3 ] transparent green stones are known as asparagus stone , [ 3 ] and blue stones have been called moroxite . [ 35 ]

  3. Gemstone Meanings: Power and Significance of the 25 Most ...

    www.aol.com/gemstone-meanings-power-significance...

    Gemstone meanings are inspired by everything from royal traditions and chakras to ancient cultures and spiritual thoughts. “The myriad of colors of gemstones alone transmit energy via the ...

  4. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide

  5. Chatoyancy - Wikipedia

    en.wikipedia.org/wiki/Chatoyancy

    In gemology, chatoyancy (/ ʃ ə ˈ t ɔɪ. ən s i / shə-TOY-ən-see), also called chatoyance or the cat's eye effect, [1] is an optical reflectance effect seen in certain gemstones, woods, and carbon fiber. Coined from the French œil de chat, meaning 'cat's eye'. The chatoyant effect is typically characterized by one or more well-defined ...

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Whether a gemstone is a natural stone or synthetic, the chemical, physical, and optical characteristics are the same: They are composed of the same mineral and are colored by the same trace materials, have the same hardness and density and strength, and show the same color spectrum, refractive index, and birefringence (if any). Lab-created ...

  7. 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 ...

  8. The Potentially Fatal Tick-Borne Illness You Haven't ... - AOL

    www.aol.com/lifestyle/potentially-fatal-tick...

    It’s called Alpha-gal syndrome (AGS), and it can make people bitten by certain ticks severely allergic to certain animal proteins found in mammals — meaning it is often triggered after a ...

  9. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Happy the man who shall catch the stone ere it falls." (von Haxthausen 1854: 355). Henry Timberlake, the British emissary to the Overhill Cherokee during the 1761–1762 Timberlake Expedition, records a story about medicine men ("conjurers") using gemstones, which is a variant of the Horned Serpent legend in Iroquois mythology. One luminous gem ...

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