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2. Luminous gemstones - Wikipedia

   en.wikipedia.org/wiki/Luminous_gemstones

   The Syrian rhetorician Lucian (c. 125–180 CE) describes a statue of the Syrian goddess Atargatis in Hierapolis Bambyce (present-day Manbij) with a gem on her head called Greek lychnis (λύχνος, "lamp; light") (Schafer 1963: 237). "From this stone flashes a great light in the night-time, so that the whole temple gleams brightly as by the ...

3. Asterism (gemology) - Wikipedia

   en.wikipedia.org/wiki/Asterism_(gemology)

   An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted). A gemstone that exhibits this effect is called a star stone or asteria.

4. Adularescence - Wikipedia

   en.wikipedia.org/wiki/Adularescence

   The schiller, appearing to move as the stone is turned (or as the light source is moved), gives the impression of lunar light floating on water (accounting for moonstone's name). [1] Though white schiller is the most common, in rarer specimens, orange or blue lusters are produced.

5. Lustre (mineralogy) - Wikipedia

   en.wikipedia.org/wiki/Lustre_(mineralogy)

   Iridescence is the 'play' or 'fire' of rainbow-coloured light caused by very thin regular structures or layers beneath the surface of a gemstone. Similar to a thin film of oil on water, these layers interfere with the rays of reflected light, reinforcing some colours and cancelling others. Iridescence is seen at its best in precious opal. [14]

6. Cordierite - Wikipedia

   en.wikipedia.org/wiki/Cordierite

   Light scattered by air molecules is polarized, and the direction of the polarization is at right angles to a line to the sun, even when the sun's disk itself is obscured by dense fog or lies just below the horizon. [9] Gem quality iolite varies in color from sapphire blue to blue violet to yellowish gray to light blue as the light angle changes ...

7. Badger Daylighting - Wikipedia

   en.wikipedia.org/wiki/Badger_Daylighting

   The firm's main business is the use of pressurized water and vacuums to excavate buried pipelines, pipes, cables, and other buried infrastructure. [8] It serves customers in various industries, including the oil and gas, utility, and telecommunication sectors.