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  2. Crystal - Wikipedia

    en.wikipedia.org/wiki/Crystal

    A crystal's crystallographic forms are sets of possible faces of the crystal that are related by one of the symmetries of the crystal. For example, crystals of galena often take the shape of cubes, and the six faces of the cube belong to a crystallographic form that displays one of the symmetries of the isometric crystal system. Galena also ...

  3. Category:Crystals - Wikipedia

    en.wikipedia.org/wiki/Category:Crystals

    This page was last edited on 26 November 2019, at 06:09 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  4. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...

  5. The Crystals - Wikipedia

    en.wikipedia.org/wiki/The_Crystals

    Kenniebrew is the only Crystal who remained active throughout their touring from the 1970s to then, performing with Patricia Pritchett-Lewis, a member since 2005, and Melissa "MelSoulTree" Grant, a member since 2002. That trio of Crystals self-released a CD in 2010 entitled Live in Asia, recorded in Singapore.

  6. Liquid crystal - Wikipedia

    en.wikipedia.org/wiki/Liquid_crystal

    Liquid crystal color transitions are used on many aquarium and pool thermometers as well as on thermometers for infants or baths. [84] Other liquid crystal materials change color when stretched or stressed. Thus, liquid crystal sheets are often used in industry to look for hot spots, map heat flow, measure stress distribution patterns, and so on.

  7. Crystal structure - Wikipedia

    en.wikipedia.org/wiki/Crystal_structure

    Crystal structure of table salt (sodium in purple, chlorine in green). In crystallography, crystal structure is a description of ordered arrangement of atoms, ions, or molecules in a crystalline material. [1]

  8. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    Crystal systems that have space groups assigned to a common lattice system are combined into a crystal family. The seven crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Informally, two crystals are in the same crystal system if they have similar symmetries (though there are many exceptions).

  9. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem , jewel , precious stone , semiprecious stone , or simply gem ) is a piece of mineral crystal which, when cut or ...