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  2. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/Smoky_quartz

    Smoky quartz. Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within ...

  3. List of RAL colours - Wikipedia

    en.wikipedia.org/wiki/List_of_RAL_colours

    RAL 1015. Light ivory. Mandatory for all steel work in P&G / mandatory for taxis in Germany since 1971, although in limited states only in recent years. RAL 1016. Sulfur yellow. Standard European ambulance colour in accordance with CEN 1789. [ 2 ] RAL 1017. Saffron yellow.

  4. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    Interference colour chart. In optical mineralogy, an interference colour chart, also known as the Michel-Levy chart, is a tool first developed by Auguste Michel-Lévy to identify minerals in thin section using a petrographic microscope. With a known thickness of the thin section, minerals have specific and predictable colours in cross ...

  5. List of colors (alphabetical) - Wikipedia

    en.wikipedia.org/wiki/List_of_colors_(alphabetical)

    This is an accepted version of this page This is the latest accepted revision, reviewed on 30 June 2024. For other color lists, see Lists of colors. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "List of colors" alphabetical – news ...

  6. ISCC–NBS system - Wikipedia

    en.wikipedia.org/wiki/ISCC–NBS_system

    The ISCC–NBS System of Color Designation is a system for naming colors based on a set of 13 basic color terms and a small set of adjective modifiers. It was first established in the 1930s by a joint effort of the Inter-Society Color Council (ISCC), made up of delegates from various American trade organizations, and the National Bureau of ...

  7. Citrine (colour) - Wikipedia

    en.wikipedia.org/wiki/Citrine_(colour)

    Citrine / ˈ s ɪ t r iː n / is a colour, the most common reference for which is certain coloured varieties of quartz which are a medium deep shade of golden yellow. Citrine has been summarized at various times as yellow, greenish-yellow, brownish yellow or orange. [2] The original reference point for the citrine colour was the citron fruit.

  8. 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. Naturally occurring prasiolite has also been found in the Thunder Bay area of Canada.

  9. Llanite - Wikipedia

    en.wikipedia.org/wiki/Llanite

    Llanite. Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals. Llanite comes from a hypabyssal porphyritic rhyolite dike that intrudes Precambrian ...

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