Crystallography

technique for use in the characterisation of crystalline materials

temperature at which certain solid substances change from one crystal structure to another

empirical rule resembling the rule of mixtures

system of detailed crystal structure classification

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material property

Pericline may refer to any of the following geological or mineralogical structures: A doubly plunging anticline or syncline. A form of albite exhibiting elongate prismatic crystals. Pericline twinning, a type of crystal twinning in which crystals show fine parallel twin laminae, typically found in the alkali feldspar microcline. The twinning results from a structural transformation between high temperature and low temperature forms.

factor used to determine the compatibility of an ion with a crystal structure

Geological concept

source for evaporative crystal growth

isometry of the Eluclidean plane

In physics, a phason is a form of collective excitation found in aperiodic crystal structures. Phasons are a type of quasiparticle: an emergent phenomenon of many-particle systems. The phason can also be seen as a degree of freedom unique to quasicrystals. Similar to phonons, phasons are quasiparticles associated with atomic motion. However, whereas phonons are related to the translation of atoms, phasons are associated with atomic rearrangement. As a result of this rearrangement, or modulation, the waves that describe the position of atoms in the crystal change phase—hence the term "phason".

In materials science (specifically crystallography), cocrystals are "solids that are crystalline, single-phase materials composed of two or more different molecular or ionic compounds generally in a stoichiometric ratio which are neither solvates nor simple salts." A broader definition is that cocrystals "consist of two or more components that form a unique crystalline structure having unique properties." Several subclassifications of cocrystals exist.

solid state physics term

thumb|Attendees at the International Union of Crystallographers meeting in 1951 A crystallographer is a type of scientist who practices crystallography, in other words, who studies crystals.

theorem about admissible crystal symmetries

crystal growth technique

loss of information concerning the phase that can occur when making a physical measurement

the ratio of the ionic radius of the cation to the ionic radius of the anion in a cation-anion compound

geological process by which two elements simultaneously substitute into a crystal

Calcium chloroaluminate formed by reaction of AFm hydrates with chloride ions