Amorphous substances have no definite repeating pattern in their atomic structures. There may be small regions of order, but, overall there is considerable disorder. Most substances we contact on a day to day basis are amorphous.
(a-mor'-phous) The state of a solid lacking a crystal structure, specifically lacking long-range order. andesite (an-de-site) A dark-colored to light gray, fine-grained extrusive igneous rock that typically formed through the relatively rapid crystallization of a lava. Andesites can also form through the accumulation of pyroclastic material explosively erupted from a volcano. Andesites are typically porphyritic or composed of two sizes of crystalline material. The larger crystals or phenocrysts are composed primarily of zoned sodic plagioclase (especially andesine) and one or more of the following mafic minerals, biotite, hornblende, pyroxene, and are surrounded by a groundmass consisting of finer-grained minerals of the same composition as the phenocrysts but too small to be seen without a microscope. Andesites contain more silica, aluminum, sodium, and potassium and less magnesium, iron, and calcium than basalts. If an andesitic magmas undergoes magmatic differentiation typically there will be an increase in Si, Al, Na, and K, and a decrease in Mg, Fe, and Ca, dacite and ultimately rhyolite lavas could be produced. Andesite was named after the Andes Mountains of South America.
Without a regular structure. Amorphous minerals do not have a repeating crystalline matrix. Glass, for example, is amorphous because it is cooled in the kiln quickly enough that no crystals have an opportunity to form.
A property meaning that something does not have a regular structure. Glass ( www.glass-fabricators.com) is an example of an amorphous material, as a result of its being cooled too rapidly to form a crystalline structure.
A condition where atoms and molecules of a material are not arranged in definite pattern or form (that is, the material is not crystalline). A characteristic of amorphous materials is lack of certain well-defined physical properties such as distinct melting point or boiling point. Generally, amorphous materials are poor conductors of heat and electricity. Glass, carbon and rosin are examples of amorphous materials.
An uncrystallized substance. From the Latin adamas, meaning invincible, is derived the term "adamantine" used to describe the brilliance, purity and hardness of a diamond. The diamond in the photo is of a pear-drop shape.
Solid materials crystallized with no specific atomic arrangements. This occurs when this layers are formed in a vacuum from vaporized materials as well as when materials are rapidly cooled down from melting state.
An amorphous material is non-crystalline. Within the starch granule there are both amorphous and crystalline regions. The amorphous areas are characterised by a higher degree of molecular disorder with the chains having a random conformation. In the crystalline zones the linear sections of molecules, both of amylose and amylopectin, are arranged in parallel crystalline bundles.
Having an irregular structure. Amorphous crystal structures are more useful in optical assemblies since they are not as prone to fracture along a crystal boundary. Crystals can sometimes be converted from mono-crystalline to poly-crystalline to amorphous by proper annealing.