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  2. 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 ...

  3. Nike Air Max - Wikipedia

    en.wikipedia.org/wiki/Nike_Air_Max

    The Air Max 1 continues to enjoy significant popularity with sneaker enthusiasts, and Nike re-releases the model with original and new exterior designs ("colorways") on a regular basis. [citation needed] In 2023, the Air Max 1 '86 "Big Bubble" was introduced. This variation celebrated the model's 35th anniversary with a design inspired by early ...

  4. Nike Air Tailwind - Wikipedia

    en.wikipedia.org/wiki/Nike_Air_Tailwind

    Nike Air Tailwind is a line of running shoes produced by Nike, Inc..The shoe is notable for being the first shoe to implement Nike's air technology in the sole. The technology would go on to become a pivotal part of the company's identity not only in the quality of its shoes but also in the design and style of its products.

  5. 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]

  6. 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 ...

  7. Iceland spar - Wikipedia

    en.wikipedia.org/wiki/Iceland_spar

    Calcite rhombohedral crystal structure. Iceland spar is a colourless, transparent variety of calcium carbonate (CaCO 3). [3] It crystallizes in the trigonal system, typically forming rhombohedral crystals. [4] It has a Mohs hardness of 3 and exhibits double refraction, splitting a ray of light into two rays that travel at different speeds and ...

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