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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Citrine is a variety of quartz whose color ranges from pale yellow to brown due to a submicroscopic distribution of colloidal ferric hydroxide impurities. [40] Natural citrines are rare; most commercial citrines are heat-treated amethysts or smoky quartzes .

  3. Prasiolite - Wikipedia

    en.wikipedia.org/wiki/Prasiolite

    Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz.. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland.

  4. Emerald - Wikipedia

    en.wikipedia.org/wiki/Emerald

    Main emerald producing countries. Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] ...

  5. Geode - Wikipedia

    en.wikipedia.org/wiki/Geode

    A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.

  7. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...

  8. Citrine - Wikipedia

    en.wikipedia.org/wiki/Citrine

    Citrine most commonly refers to: Citrine (colour), a shade of yellow; Citrine quartz, a yellow variety of quartz; Citrine may also refer to: People.

  9. Citrine (mineral) - Wikipedia

    en.wikipedia.org/?title=Citrine_(mineral...

    From other disambiguation: This is a redirect from a title with an alternative disambiguation qualifier of Citrine. The disambiguation of these page names is not incorrect, incomplete nor unnecessary. For those redirects use {{R from incorrect disambiguation}}, {{R from incomplete disambiguation}} or {{R from unnecessary disambiguation}} instead.

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