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Folktales about luminous gemstones are an almost worldwide motif in mythology and history among Asian, European, African, and American cultures. Some stories about light-emitting gems may have been based on luminescent and phosphorescent minerals such as diamonds.
Lustre (British English) or luster (American English; see spelling differences) is the way light interacts with the surface of a crystal, rock, or mineral.The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.
Although old radium dials generally no longer produce light, this is due to the breakdown of the crystal structure of the luminous zinc sulfide rather than the radioactive decay of the radium. The radium isotope ( 226 Ra ) used has a half-life of about 1,600 years, [ 7 ] so radium dials remain essentially just as radioactive as when originally ...
Moonstone; General; Category: Anorthoclase variety: Formula (repeating unit) (Na,K)AlSi 3 O 8: Crystal system: Monoclinic: Identification; Color: Can be numerous ...
In many cases luminous dials were implemented with non-radioactive fluorescent materials excited by light; such devices glow in the dark after exposure to light, but the glow fades. [14] Where long-lasting self-luminosity in darkness was required, safer radioactive promethium -147 (half-life 2.6 years) or tritium (half-life 12 years) paint was ...
The name "Luminous" was chosen to reflect the crystal theme of the Final Fantasy series. [5] There were many major factors that the team considered while building the engine, as they wanted to ensure the highest possible quality for high-end games. Some of the environmental factors included lighting, shading and modeling.
Crystal Retinal 24 “I normally stick to the Rx kind, but this OTC option has won me over. ... Major Skin Hydra-Luxe Luminous Skin Perfecting Foundation “Dewy makeup + acne usually don’t mix ...
Carbuncles and their chimeras have spanned three millennia. Intermingling red gems until the time of their crystal-chemical definitions at the end of the 18th century, they united, for commercial purposes, the various sardonyx and carnelian, garnets, ruby and spinel as an intrinsic common quality of their luminous dispersion magnified by artifacts.
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