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  2. Fluorescence - Wikipedia

    en.wikipedia.org/wiki/Fluorescence

    Many types of calcite and amber will fluoresce under shortwave UV, longwave UV and visible light. Rubies, emeralds, and diamonds exhibit red fluorescence under long-wave UV, blue and sometimes green light; diamonds also emit light under X-ray radiation. Fluorescence in minerals is caused by a wide range of activators. In some cases, the ...

  3. Fluorite - Wikipedia

    en.wikipedia.org/wiki/Fluorite

    Many samples of fluorite exhibit fluorescence under ultraviolet light, a property that takes its name from fluorite. [28] Many minerals, as well as other substances, fluoresce. Fluorescence involves the elevation of electron energy levels by quanta of ultraviolet light, followed by the progressive falling back of the electrons into their ...

  4. Hyalite - Wikipedia

    en.wikipedia.org/wiki/Hyalite

    A sample of hyalite Fluorescent hyalite under an ultraviolet blacklight. Hyalite is a transparent form of opal with a glassy lustre. It may exhibit an internal play of colors if natural inclusions are present. It is also called Muller's glass, water opal, and jalite.

  5. Benitoite - Wikipedia

    en.wikipedia.org/wiki/Benitoite

    Benitoite fluoresces under short wave ultraviolet light, appearing bright blue to bluish white in color. The more rarely seen clear to white benitoite crystals fluoresce red under long-wave UV light. It was discovered in 1907 by prospector James M. Couch in the San Benito Mountains roughly halfway between San Francisco and Los Angeles.

  6. Apatite - Wikipedia

    en.wikipedia.org/wiki/Apatite

    Apatite is the defining mineral for 5 on the Mohs scale. [11] It can be distinguished in the field from beryl and tourmaline by its relative softness. It is often fluorescent under ultraviolet light. [12] Apatite is one of a few minerals produced and used by biological micro-environmental systems. [7]

  7. Scheelite - Wikipedia

    en.wikipedia.org/wiki/Scheelite

    Scheelite fluoresces under shortwave ultraviolet light, the mineral glows a bright sky-blue. The presence of molybdenum trace impurities occasionally results in a green glow. Fluorescence of scheelite, sometimes associated with native gold, is used by geologists in the search for gold deposits.

  8. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Scholars have suggested that the myth may have originated with snake worship, or light reflected by a serpent's eye, or the flame color of certain snakes' lips. In only a relative few of these legends is the stone luminous, this variant being known in India, Ceylon, ancient Greece, Armenia, and among Cherokee Indians (Ball 1938: 502).

  9. List of mineral tests - Wikipedia

    en.wikipedia.org/wiki/List_of_mineral_tests

    Color of the mineral. Color alone is not diagnostic. For example quartz can be almost any color, ... Many minerals glow when put under a UV light. Radioactivity