crystal
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A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification.
The word crystal derives from the Ancient Greek word κρύσταλλος (krustallos), meaning both "ice" and "rock crystal", from κρύος (kruos), "icy cold, frost".
Examples of large crystals include snowflakes, diamonds, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Examples of polycrystals include most metals, rocks, ceramics, and ice. A third category of solids is amorphous solids, where the atoms have no periodic structure whatsoever. Examples of amorphous solids include glass, wax, and many plastics.
Despite the name, lead crystal, crystal glass, and related products are not crystals, but rather types of glass, i.e. amorphous solids.
Crystals are often used in pseudoscientific practices such as crystal therapy, and, along with gemstones, are sometimes associated with spellwork in Wiccan beliefs and related religious movements.
- amethyst [from Latin amethystus, from Greek, 'preventer of drunkenness, amethyst', from methy 'wine'] 紫水晶
- Burgundy: 1. 勃艮第葡萄酒; 2. a dark red colour 深紫红色
Kris·tall·nacht /krĭs′təl-näkt′/
The night of November 9, 1938, on which the Nazis coordinated an attack on Jewish people and their property in Germany, Austria, and the Sudetenland. Sudetenland is an area in the north west of the Czech [捷克] Republic which Hitler attacked and took control of in 1938, just before World War II.
六级/考研单词: crystal, constituent, atom, molecule, geometry, orient, derive, frost, diamond, fuse, ceramics, tertiary, wax, despite, seldom, therapy, jewel, secular, drunken, coordinate
标签：glass,amorphous,crystal,solids,crystals,include 来源： https://www.cnblogs.com/funwithwords/p/16627217.html