Publication

Three-dimensionally modulated incommensurate crystal structure of lazurite from the Baikal region

Gervais Chapuis
2003
Journal Articles

Abstract

The three-dimensionally modulated incommensurate crystal structure of lazurite from the Baikal region was determined for the first time. The structure was solved within the cubic system with the unit-cell parameter a(cub) = 9.077(1) Angstrom and the (3+2)-dimensional superspace group Pnn2(q(1), q(2)) under the assumption of a twin model consisting of three orthorhombic components related by a threefold axis along the [111] direction. The structure was refined using 257 main reflections and 2392 first-order satellite reflections with the isotropic thermal parameters to wR(0) = 1.98% and wR(1) = 7.50% respectively. (C) 2003 MAIK "Nauka/Interperiodica".

Official source

https://infoscience.epfl.ch/entities/publication/8e7861ab-fc9a-469a-a016-2e16ca403cdb

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Gervais Chapuis
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8e7861ab-fc9a-469a-a016-2e16ca403cdb

About this result

Related concepts (14)

Crystal structure

In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions, or molecules in a crystalline material. Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns that repeat along the principal directions of three-dimensional space in matter. The smallest group of particles in the material that constitutes this repeating pattern is the unit cell of the structure.

Cubic crystal system

In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals. There are three main varieties of these crystals: Primitive cubic (abbreviated cP and alternatively called simple cubic) Body-centered cubic (abbreviated cI or bcc) Face-centered cubic (abbreviated cF or fcc) Note: the term fcc is often used in synonym for the cubic close-packed or ccp structure occurring in metals.

Tridymite

Infobox mineral | name = Tridymite | category = Oxide mineral (or tectosilicate), quartz group | boxwidth = | boxbgcolor = | image = Tridymite tabulars - Ochtendung, Eifel, Germany.jpg | imagesize = 260px | caption = tabular tridymite crystals from Ochtendung, Eifel, Germany | formula = SiO2 | molweight = 60.08 g/mol | strunz = 4.DA.10 | IMAsymbol = Trd | system = Orthorhombic (α-tridymite) | class = Disphenoidal (222) H–M symbol: (222) | symmetry = C2221 | color = Colorless, white | habit = Platy – sheet forms | cleavage = {0001} indistinct, {1010} imperfect | fracture = Brittle – conchoidal | mohs = 7 | luster = Vitreous | refractive = 'nα=1.