Crystals Crystals An anisodesmic crystal (sometimes anisodemic crystal) is a crystal containing bonds with differing electrostatic valencies. An example of an anisodesmic crystal is graphite. All other crystals are known as isodesmic crystals (or isodemic) and examples include diamond and halite. These terms are of particular importance when discussing the structural chemistry of minerals. ...more on Wikipedia about "Anisodesmic crystal"
A boule is a term used to describe a single crystal ingot produced by synthetic means. ...more on Wikipedia about "Boule (crystal)"
A crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. ...more on Wikipedia about "Crystal"
Crystallinity is the degree of structural order in a solid, often represented by a fraction or percentage as a measure of how likely atoms or molecules are to be arranged in a regular pattern, namely into a crystal. This property can often be measured directly using diffraction techniques, such as x-ray diffraction: greater crystallinity yields a sharper diffracted beam. ...more on Wikipedia about "Crystallinity"
A crystallite is a domain of solid-state matter that has the same structure as a single crystal. ...more on Wikipedia about "Crystallite"
A crystal dendrite is a crystal that develops with a typical multi-branching tree-like form. Dendritic crystal growth is very common and illustrated by snowflake formation and frost patterns on a window. Dendritic crystallization forms a natural fractal pattern. ...more on Wikipedia about "Dendrite (crystal)"
Desert rose is the colloquial name given to rosette formations of the minerals gypsum and barite with sand inclusions. ...more on Wikipedia about "Desert rose"
A hopper crystal is a form of crystal, defined by its " hoppered" shape. ...more on Wikipedia about "Hopper crystal"
An isodesmic crystal is a crystal in which all the bonds have the same electrostatic valency. This means that all the bonds are of the same strength. Diamonds and halite have isodesmic crystals. The opposite of an isodesmic crystal is an anisodesmic crystal, in which anions more strongly bonded to central coordinating cation. Graphite is an example of an isodesmic crystal. ...more on Wikipedia about "Isodesmic crystal"
Lattice constant, or a, defines the distance between atoms in crystal lattice. It is a measure of structural compatibility between different materials. ...more on Wikipedia about "Lattice constant"
Crystalline materials (mainly metals and alloys, but also stoichiometric salts and other materials) are made up of solid regions of ordered matter (atoms placed in one of a number of ordered formations called Bravais lattices). These regions are known as crystals. A perfect crystal is one that contains no point, linear, or planar imperfections. There are a wide variety of crystallographic defects. ...more on Wikipedia about "Perfect crystal"
A polycrystalline material is made of several smaller crystallites. Cf. monocrystal. ...more on Wikipedia about "Polycrystalline"
Rock candy is a type of confectionery composed of relatively large sugar crystals. ...more on Wikipedia about "Rock candy"
A seed crystal is a small piece of single crystal material from which a large crystal of, usually, the same material is to be grown. The large crystal can be grown by dipping the seed into a supersaturated solution, into molten material that is then cooled, or by growth on the seed face by passing vapour of the material to be grown over it. ...more on Wikipedia about "Seed crystal"
A single crystal, also called monocrystal, is a crystalline solid in which the crystal lattice of the entire sample is continuous and unbroken to the edges of the sample, with no grain boundaries. The opposite of a single crystal sample is a polycrystalline sample, which is made up of a number of smaller crystals known as crystallites. Because of a variety of entropic effects on the microstructure of solids, including the distorting effects of impurities and the mobility of crystallographic defects and dislocations, single crystals of meaningful size are exceedingly rare in nature, and can also be difficult to produce in the laboratory under controlled conditions. ...more on Wikipedia about "Single crystal"
This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia . Direct links to the original articles are in the text.
If you use exact copy or modified of this article you should preserve above paragraph and put also : It uses material from
the Shortopedia article about "Crystals".
| MAIN PAGE | MAIN INDEX | CONTACT US |