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2. Colloidal crystal - Wikipedia

   en.wikipedia.org/wiki/Colloidal_crystal

   A colloidal crystal is an ordered array of colloidal particles and fine grained materials analogous to a standard crystal whose repeating subunits are atoms or molecules. [1] A natural example of this phenomenon can be found in the gem opal , where spheres of silica assume a close-packed locally periodic structure under moderate compression .

3. Poly(methyl methacrylate) - Wikipedia

   en.wikipedia.org/wiki/Poly(methyl_methacrylate)

   PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can also be used as a casting resin, in inks and coatings, and for many ...

4. Acicular (crystal habit) - Wikipedia

   en.wikipedia.org/wiki/Acicular_(crystal_habit)

   Strictly speaking, the word refers to a growth habit that is slender and tapering to a point. Prismatic crystals are not acicular; however, colloquial usage has altered the commonly understood meaning of the word. When writing for mineralogical publications, authors should restrict their usage of "acicular" to crystals with the tapering growth ...

5. Phenocryst - Wikipedia

   en.wikipedia.org/wiki/Phenocryst

   This granite, from the Swiss side of the Mont Blanc massif, has large white phenocrysts of plagioclase (that have trapezoid shapes when cut through). 1 euro coin (diameter 2.3 cm) for scale. A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock.

6. Costume jewelry - Wikipedia

   en.wikipedia.org/wiki/Costume_jewelry

   The trend of jewelry-making at home by hobbyists for personal enjoyment or for sale on sites like Etsy has resulted in the common practice of buying wholesale costume jewelry in bulk and using it for parts. There is a rise in demand for artificial or imitation jewelry by 85% due to the increase in gold prices, according to a 2011 report. [14]

7. Single crystal - Wikipedia

   en.wikipedia.org/wiki/Single_crystal

   Basic crystal growth methods can be separated into four categories based on what they are artificially grown from: melt, solid, vapor, and solution. [2] Specific techniques to produce large single crystals (aka boules) include the Czochralski process (CZ), Floating zone (or Zone Movement), and the Bridgman technique. Dr.