In chemistry, trigonal planar is a molecular geometry with one atom at the center and three atoms at the corners of a triangle all in one plane.
en.wikipedia.org/wiki/Trigonal_planar_molecular_geometr... en.wikipedia.org/wiki/Trigonal_planar_molecular_geometry
In crystallography, the trigonal crystal system is one of the seven crystal systems, and the rhombohedral lattice system is one of the seven lattice systems...
en.wikipedia.org/wiki/Trigonal_crystal_system en.wikipedia.org/wiki/Trigonal_crystal_system
What types of crystals are there? There are a couple of ways to answer this question. I generally think in terms of crystal systems and lattice types. There are 7 crystal systems: trigonal - possess a single 3-fold axis of rotation instead of the 6-fold axis of the hexagonal division...
www.chemistry.co.nz/crystal_types.htm
of, relating to, or being the division of the hexagonal crystal system or the forms belonging to it characterized by a vertical axis of threefold symmetry...
www.merriam-webster.com/dictionary/TRIGONAL www.merriam-webster.com/dictionary/TRIGONAL
Trigonal Trapezohedral Class, 12th, 3 2 The trigonal system is sometimes included in the hexagonal system as a division, called the rhombohedral division with the other hexagonal classes grouped into the hexagonal division.
www.galleries.com/minerals/symmetry/trigonal.htm www.galleries.com/minerals/symmetry/trigonal.htm
Dieser Beschreibungstext soll einem Anwender im Suchdienst bei Auffinden dieser Datei erscheinen Range of application...
www.siefer-trigonal.de/ www.siefer-trigonal.de/
Definition of trigonal from Webster's New World College Dictionary. Meaning of trigonal. Pronunciation of trigonal. Definition of the word trigonal.
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Encyclopedia: Rhombohedral crystal system
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In crystallography, the rhombohedral (or trigonal) crystal system is one of the seven lattice point groups, named after the two-dimensional rhombus. A crystal system is described by three basis vecto...
en.wikipedia.org/wiki/Rhombohedral_crystal_system
Trigonal Crystal Classes TRIGONAL - Mike and Darcy Howard's Details on The Hexagonal System (Trigonal Division) Trigonal Minerals Crystal Form Example.
webmineral.com/crystall.shtml
Trigonal Planar Molecular Geometry An example of trigonal planar electron pair geometry (E. P. G.) and molecular geometry is BH3. This molecule is electron deficient and does not follow the octet rule because it has only 6 valence electrons. The hydrogen atoms are as far apart as possible at 120o.
www.elmhurst.edu/~chm/vchembook/203trigplanar.html