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  2. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    R = n 1 a 1 + n 2 a 2 + n 3 a 3, where n 1 , n 2 , and n 3 are integers and a 1 , a 2 , and a 3 are three non-coplanar vectors, called primitive vectors . These lattices are classified by the space group of the lattice itself, viewed as a collection of points; there are 14 Bravais lattices in three dimensions; each belongs to one lattice system ...

  3. Hexagonal crystal family - Wikipedia

    en.wikipedia.org/wiki/Hexagonal_crystal_family

    However, the rhombohedral axes are often shown (for the rhombohedral lattice) in textbooks because this cell reveals the 3 m symmetry of the crystal lattice. The rhombohedral unit cell for the hexagonal Bravais lattice is the D-centered [ 1 ] cell, consisting of two additional lattice points which occupy one body diagonal of the unit cell with ...

  4. Stibarsen - Wikipedia

    en.wikipedia.org/wiki/Stibarsen

    Stibarsen has the same crystal structure as arsenic and antimony, with the intermediate values of the lattice parameters. This structure (space group R 3 m No. 166) is variably described as hexagonal, trigonal and rhombohedral because of the overlap between these terms (see trigonal crystal system).

  5. Rhombohedron - Wikipedia

    en.wikipedia.org/wiki/Rhombohedron

    The other coordinates can be obtained from vector addition [5] of the 3 direction vectors: e 1 + e 2, e 1 + e 3, e 2 + e 3, and e 1 + e 2 + e 3. The volume V {\displaystyle V} of a rhombohedron, in terms of its side length a {\displaystyle a} and its rhombic acute angle θ {\displaystyle \theta ~} , is a simplification of the volume of a ...

  6. Trigonal trapezohedron - Wikipedia

    en.wikipedia.org/wiki/Trigonal_trapezohedron

    In geometry, a trigonal trapezohedron is a polyhedron with six congruent quadrilateral faces, which may be scalene or rhomboid. [1] [2] The variety with rhombus-shaped faces faces is a rhombohedron. [3] [4] An alternative name for the same shape is the trigonal deltohedron. [5]

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    The Kita Hands-Free sneakers have nearly 8,000 reviews and, while they have laces, you don't need to use them to secure the shoe into place. Here are 10 pairs of hands-free shoes you can pick up ...

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