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Luminous meaning1/23/2024 ![]() ![]() The luminescent Bologna Stone (impure barite), which was discovered by Vincenzo Cascariolo in 1602, was sometimes called " lapis lunaris" ("lunar stone"), because, like the moon, it gave out in the darkness the light it received from the sun (Kunz 1913: 168). According to Prafulla Chandra Ray, the Indian king Bhoja (r. 1193–1280) and it was apparently rediscovered by Robert Boyle in 1663, who also found that some diamonds will luminesce under pressure. The phosphorescent quality of diamonds when heated by sunlight is usually believed to have been first revealed by Albertus Magnus (c. Both diamonds and white topaz may phosphoresce if heated below red heat. Most diamonds are triboluminescent if rubbed with a cloth, and a few are photoluminescent after exposure to direct sunlight. The American geologist Sydney Hobart Ball, who wrote an article on "Luminous Gems, Mythical and Real", outlined the history of discoveries about luminescent and phosphorescent minerals. ![]() Thermoluminescence re-emits previously absorbed electromagnetic radiation upon being heated (e.g., thermoluminescence dating). Triboluminescence generates light through the breaking of chemical bonds in a material when it is rubbed, pulled apart, scratched, or crushed. Two types of luminescent phenomena are relevant to crystalline materials. When the energy comes from light or other electromagnetic radiation, it is referred to as photoluminescence which is divisible between fluorescence when the glow ceases immediately with the excitation and phosphorescence when the glow continues beyond the period of excitation. Luminescence is caused by the absorption of energy that is released in small amounts. Luminescence is spontaneous emission of light by a substance not resulting from heat, as distinguished from incandescence, which is light emitted by a substance as a result of heating. Note that the following discussion will omit modern techniques such as X-rays and ultraviolet light that are too recent to have influenced folklore about luminous gems. Triboluminescence from rubbing together two quartz crystals.įirst, it will be useful to introduce some mineralogical terminology for gemstones that can glow when exposed to light, friction, or heat. Mineralogical luminosity Thermoluminescence from heating chlorophane specimens on a hotplate. Some stories about light-emitting gems may have been based on luminescent and phosphorescent minerals such as diamonds. ( October 2020) ( Learn how and when to remove this template message)įolktales about luminous gemstones are an almost worldwide motif in mythology and history among Asian, European, African, and American cultures. Parenthetical referencing has been deprecated convert to shortened footnotes. ![]() Please improve this article by correcting them. This article includes inline citations, but they are not properly formatted. ![]()
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