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2. Luminous gemstones - Wikipedia

   en.wikipedia.org/wiki/Luminous_gemstones

   The OED defines pyrope (from Greek Πυρωπός, lit. "fire-eyed")" as: "In early use applied vaguely to a red or fiery gem, as ruby or carbuncle; (mineralogy) the Bohemian garnet or fire-garnet"; and carbuncle or carbuncle-stone (from Latin "carbunculus", "small glowing ember") as: "A name variously applied to precious stones of a red or ...

3. Schistostega - Wikipedia

   en.wikipedia.org/wiki/Schistostega

   Schistostega pennata, also called goblin gold, [1] Dragon's gold, [2] luminous moss [1] or luminescent moss, [3] is a haplolepideous moss known for its glowing appearance in dark places. It is the only member of the family Schistostegaceae .

4. Sett (paving) - Wikipedia

   en.wikipedia.org/wiki/Sett_(paving)

   A sett, also known as a block or Belgian block, [1] is a broadly rectangular quarried stone used in paving roads and walkways. [ 2 ] [ 3 ] Formerly in widespread use, particularly on steeper streets because setts provided horses' hooves with better grip than a smooth surface, they are now encountered more usually as decorative stone paving in ...

5. Opalescence - Wikipedia

   en.wikipedia.org/wiki/Opalescence

   In contrast, common opal does not display an iridescence, but often exhibits a hazy sheen of light from within the stone – the phenomenon that gemologists strictly term as opalescence. [5] This milky sheen displayed by opal is a form of adularescence .

6. Triboluminescence - Wikipedia

   en.wikipedia.org/wiki/Triboluminescence

   A diamond may begin to glow while being rubbed; this occasionally happens to diamonds while a facet is being ground or the diamond is being sawn during the cutting process. Diamonds may fluoresce blue or red. Some other minerals, such as quartz, are triboluminescent, emitting light when rubbed together. [19]

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