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2. Mica - Wikipedia

   en.wikipedia.org/wiki/Mica

   The coating is not absorbed by freshly manufactured roofing because mica's platy structure is unaffected by the acid in asphalt or by weather conditions. Mica is used in decorative coatings on wallpaper, concrete, stucco, and tile surfaces. It also is used as an ingredient in flux coatings on welding rods, in some special greases, and as ...

3. Polychrome - Wikipedia

   en.wikipedia.org/wiki/Polychrome

   1883 reconstruction of color scheme of the entablature on a Doric temple Polychrome is the "practice of decorating architectural elements, sculpture, etc., in a variety of colors." [ 1 ] The term is used to refer to certain styles of architecture , pottery , or sculpture in multiple colors.

4. Aventurine - Wikipedia

   en.wikipedia.org/wiki/Aventurine

   Aventurine is used for a number of applications, including landscape stone, building stone, aquaria, monuments, and jewelry. Aventurine is a form of quartzite , characterised by its translucency and the presence of platy mineral inclusions that give it a shimmering or glistening effect termed aventurescence .

5. Asterism (gemology) - Wikipedia

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

   The star-effect or "asterism" is caused by the difference in refractive index between the host material and that of the dense inclusions of tiny fibers of rutile (also known as "silk"). Rutile causes the relative bright relief of a star in a host material such as corundum, which has a refractive index between 1.760 and 1.778, much lower than ...

6. Moonstone (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Moonstone_(gemstone)

   The name moonstone derives from the stone's characteristic visual effect, called adularescence (or schiller), which produces a milky, bluish interior light. This effect is caused by light diffraction through alternating layers of orthoclase and albite within the stone.

7. Why a massive California tsunami alert was issued — then soon ...

   www.aol.com/news/why-massive-california-tsunami...

   Coastal areas in Northern California began evacuating residents after a 7.0 earthquake off Humboldt County's coast prompted a tsunami warning. Luckily, the worst didn't play out. But emergency ...